The nickname of "Delta" special forces is 1 combat unit of the US Army Special Forces. This unit is an elite unit derived from the "Green Beret" special forces of the US Army. Its main task is to deal with various terrorist activities that threaten the interests of the United States in the world. At present, it has two squadrons, each with 16 people. Although this unit has no impressive record since its establishment, it is the fist unit of the United States against terrorism.

The "Green Beret" is the largest special force in the US Army and the favorite force of the US President. This unit is equipped with various infantry weapons and transport helicopters, and has very advanced communication equipment, including satellite communication and light communication equipment, with a communication distance of 3,200 kilometers. "Green Berets" are often sent to many countries in the world to perform various tasks.

One of the top ten special forces in the world. Navy SEALs are one of the most mysterious and powerful special operations forces in the world. So far, few people outside know where the SEALs will perform their tasks, where they will be used as training bases and so on. However, this mysterious force always appears at the moment when the country needs them most. The news revealed to the outside world is that there are only more than 200 active SEALs in the United States. They are both civil and military, and they are strong. Because the mission is mainly carried out at night, the requirement for vision is no less than that of fighter pilots. To enter the SEAL team, trainees have to undergo the hardest and most rigorous special military training in the world, and sometimes the training is completely an exchange of live ammunition. Students cultivate perseverance and team fighting ability in extraordinary difficulties, and finally 70% students will be eliminated. Therefore, being a SEAL soldier is the highest honor for American soldiers.