Full Revelation of the Five Major Tier-1 Special Forces in the United States

The five top elite units of the U.S. military are all subordinate to the Joint Special Operations Command (JSOC) and are defined as Tier 1 Special Mission Units. These units operate covertly for extended periods, exerting significant global influence while leaving almost no trace. The missions they undertake are highly classified, high-risk operations that conventional special operations forces struggle to execute efficiently and for which JSOC tolerates zero errors. They form the core strength of the U.S. "shadow war" system.

II. Detailed Analysis of the Five Major Tier-One Special Forces Units

(1) Delta Force: The Army's Versatile Tip of the Spear

The formal name of Delta Force is the 1st Special Forces Operational Detachment-Delta ( -), also known as the Combat Applications Group, Army Compartmented Unit. It belongs to the United States Army and is one of the most well-known elite units within it.

The unit is renowned for its high degree of specialization, extreme confidentiality, and exceptionally high mission success rate. Its core mission profile includes executing critical tasks such as hostage rescue, counter-terrorism operations, direct action, special reconnaissance, high-value target capture, and dismantling the core structure of terrorist organizations. Its operational characteristics involve being composed of small-scale, highly mobile teams capable of rapid global deployment upon receiving JSOC directives. Its operational methods are extremely flexible, with mission boundaries not being fixed.

In terms of well-known operations, Delta Force successfully captured Saddam Hussein, assisted in the evacuation of U.S. diplomatic personnel during the Benghazi incident, and also carried out the "Absolute Determination" operation (an attempted capture) targeting Venezuelan President Maduro on August 4, 2018.

In terms of organizational structure, Delta Force comprises four assault squadrons (A, B, C, D Squadrons). Each squadron typically consists of two direct action assault teams, as well as a reconnaissance and surveillance unit composed of reconnaissance personnel and snipers.

Each team member has undergone multi-skill cross-training, including close-quarters combat, hand-to-hand combat, direct action, advanced shooting techniques, rapid breaching, and building clearance (room-by-room search). Selection primarily draws from the Army Special Forces (Green Berets) and Army Rangers, while theoretically allowing personnel from all branches to attempt entry. The selection process focuses on experienced special operations personnel, assessing their willpower, psychological resilience, and independent judgment. The selection process lasts approximately one week and includes high-intensity day-and-night land navigation marches with increasing loads (progressively longer distances, heavier loads, and shorter time limits), as well as repeated psychological evaluations conducted by a panel of instructors and psychologists. The final test is a loaded march of about miles with an unknown completion time (referred to as the "Long March"). After passing selection, team members must complete a roughly month-long "Operators Training Course," systematically learning skills such as small arms, support weapons, sniping and observation, advanced parachuting, close-quarters combat, demolition, intelligence techniques, and VIP protection.

(2) United States Navy SEAL Team Six: The Navy's Counterterrorism Elite

The official name of SEAL Team Six is the Naval Special Warfare Development Group ( , ), which is affiliated with the United States Navy. It is the Navy's premier counter-terrorism unit and a Tier 1 special mission force under its command.

This unit specializes in counter-terrorism, direct action, hostage rescue, high-value target strikes, counter-proliferation, and special reconnaissance. Its core strengths are reflected in two major aspects: first, its maritime combat capability, possessing a strong professional advantage in maritime infiltration, ship assaults, and operations in complex waters; second, its high-altitude parachuting capability, achieving an extremely high standard in precision, complex meteorological conditions, and long-distance infiltration. During the pursuit of Osama bin Laden, it maintained an assault team on high alert for an extended period, prepared to enter Pakistan via high-altitude parachuting to execute missions.

Organizationally, SEAL Team Six is primarily composed of six squadrons, four of which are assault squadrons: Red Squadron ("The Tribe" or "The Hunters"), Blue Squadron ("The Pirates"), Silver Squadron (which uses a hybrid insignia), and Gold Squadron ("The Knights" or "The Crusaders"). Each assault squadron oversees multiple SEAL platoons, which are further subdivided into smaller operational units. The remaining two squadrons are support squadrons, including Black Squadron ("The Vikings") and Gray Squadron. Black Squadron consists of experienced drivers and support personnel responsible for operating specialized vehicles and mobility platforms, while Gray Squadron handles reconnaissance, surveillance, intelligence gathering, and advance operations, serving as the "unseen leading hand."

The selection for SEAL Team Six exclusively draws the most outstanding members from active-duty Navy SEALs, a process known as "Green Team" selection. Candidates are top-tier SEAL operators with years of service, multiple combat deployments, and exceptional performance in their original units. The selection does not repeat basic tests but rather re-screens their capabilities and psychological limits against higher standards. The selection cycle lasts approximately one month, with a pass rate of only about half.

(III) Special Tactics Squadron: The Air Force's All-Purpose Support Unit

The 24th Special Tactics Squadron (abbreviated as 24th STS, nicknamed "White Special Operations Forces") is affiliated with the United States Air Force and is the only Air Force-level special operations unit within the system. Unlike other direct combat units, the core role of this squadron is as a support force. Its primary mission is to ensure highly coordinated operations between air power and ground special operations forces, providing critical support to other subordinate first-tier special operations units.

Its specific support tasks include: precise coordination of air power and close air support, personnel rescue, advanced battlefield medical care in high-risk environments, airport reconnaissance, airspace control and assessment, joint terminal attack guidance, and certain humanitarian relief operations. The unit is primarily composed of Air Force combat controllers, pararescue personnel, special reconnaissance troops, and some tactical air control personnel.

The operational model of the Special Tactics Squadron is highly distinctive. Members are typically integrated into teams of other Tier 1 units to fight alongside them, providing unique and irreplaceable capabilities, earning them the title of "free agents within the Tier 1 unit system." Among them, Combat Controllers join as reinforcements—they are certified air traffic controllers capable of coordinating air power and precisely guiding fire support in extreme environments; Pararescuemen are responsible for executing high-risk medical rescue operations; and Special Reconnaissance personnel provide forward intelligence support.

The members of this unit are not only experts in their own fields but are also trained to be versatile personnel capable of integrating into any special operations unit. They have received systematic training in counter-terrorism, direct action, hostage rescue, counter-insurgency, and special reconnaissance, making them true "all-rounders."

(IV) Ranger Reconnaissance Company: The Army's Covert Eyes and Ears

The Ranger Reconnaissance Company (abbreviated as, ) is a Tier 1 special operations force affiliated with the United States Army, operating covertly within the 75th Ranger Regiment. Composed of the most elite Rangers, this unit operates at a significantly higher capability level compared to conventional Ranger elements and maintains a notably low-profile and enigmatic operational style.

Its three core missions are active reconnaissance, continuous surveillance, and direct action. To accomplish these core missions, it also conducts operations such as raids, ambushes, patrols, demolitions, and direct fire support. Within the system, Ranger Reconnaissance Companies are often tasked with conducting forward reconnaissance and intelligence preparation for other Tier 1 units, serving as the "forward intelligence node" in the system.

The unit places immense emphasis on the integration of diverse intelligence capabilities. Members are proficient in human intelligence, signals intelligence, electronic intelligence, and communications intelligence, with some personnel also receiving training in interrogation, surveillance, and computer-related technologies. In terms of selection, candidates are chosen exclusively from the most outstanding members of the Ranger Regiment. The selection process is divided into two phases: The first phase (approximately weeks) takes place at a confidential location and includes high-intensity land navigation training with heavy loads (carrying - pounds, covering - miles daily in complex terrain), as well as psychological evaluations, individual interviews, and assessments by a review board. The second phase (approximately weeks) is the "Reconnaissance Training Course," which systematically develops all the capabilities required for reconnaissance forces. The training content covers military advanced parachuting, advanced communications, digital photography, computer operations and image processing, field survival and concealment, infiltration and exfiltration techniques, close air support, advanced driving, demolition, and advanced tactical medicine.

(V) Intelligence Support Operations Division: The Mysterious Intelligence Core of the System

The Intelligence Support Operations Division (abbreviated as ) is the most secretive and least publicly known among the five major first-level units. This unit does not focus on direct combat but is a highly militarized intelligence operations entity dedicated to providing critical intelligence support for military operations.

Its support scope is extensive, providing assistance not only to , but also to the Special Operations Command () and other intelligence agencies. The core capability involves obtaining critical information through human intelligence and signals intelligence: in terms of human intelligence, intelligence is gathered from target individuals through screening, tactical questioning, interrogation, and liaison activities; in terms of signals intelligence, it is achieved by intercepting enemy communications or deploying personnel to conduct physical eavesdropping and technical reconnaissance.

Most members hail from special forces such as the Green Berets, possessing extensive special operations backgrounds. The selection process emphasizes language proficiency, judgment, and adaptability to executing covert missions in hostile environments, rather than shooting or assault skills. Regarding its organizational structure, external observations are largely speculative. It is widely believed to consist of multiple squadrons, including operational squadrons, intelligence squadrons, signals intelligence squadrons, and mission support squadrons, with internal units also capable of direct action. Today, it has become one of the most influential and indispensable forces within the system.

III. Key Support Force: The Special Operations Aviation Regiment

Strictly speaking, the 160th Special Operations Aviation Regiment is not classified as one of the five primary special operations forces, but it has long provided critical aviation support to all primary units. It serves as an indispensable core supporting force within the system and is nicknamed the "Night Stalkers" ( ).

Its core mission is to provide special operations forces with helicopter reconnaissance, attack support, personnel airdrop and evacuation, as well as aviation mobility capabilities in hostage rescue operations. Typical operations involve using helicopters to rapidly deploy special operations forces to building rooftops, moving vehicles, naval vessels, and even airborne aircraft, while providing fire support or facilitating personnel evacuation during missions. The unit is equipped with approximately various types of helicopters, including the MH-6 "Little Bird," CH-47 "Chinook," and UH-60 "Black Hawk" series, among others, providing solid aviation support for the efficient execution of special operations.

IV. Overall System Summary

The five Tier 1 Special Mission Units under the United States Joint Special Operations Command (JSOC) have clear divisions of labor and complementary strengths, collectively forming the core combat power of U.S. special operations. The Delta Force is the Army's versatile spearhead, specializing in high-risk direct action and hostage rescue. The SEAL Team Six is the Navy's counter-terrorism elite, particularly skilled in maritime operations and high-altitude infiltration. The 24th Special Tactics Squadron is the Air Force's all-around support unit, responsible for integrating air power with ground special operations coordination. The Ranger Reconnaissance Company is the Army's covert eyes and ears, excelling in forward reconnaissance and intelligence gathering. The Intelligence Support Activity is the most mysterious intelligence core within the system, dedicated to human and signals intelligence acquisition.

Additionally, with the top-tier aviation mobility and fire support provided by the 160th Special Operations Aviation Regiment, these units form a comprehensive special operations system encompassing "reconnaissance-intelligence-operations-support." Operating in highly classified environments, they carry out missions that shape strategic outcomes, serving as a core instrument for the United States in safeguarding its global strategic interests and waging "shadow wars."