Shortly after being established in January 1962, SEAL Team ONE deployed to Vietnam to take initial surveys and make preparations for training indigenous South Vietnamese in the tactics, techniques, and procedures of maritime commandos.

Platoons from SEAL Team ONE and SEAL Team TWO were assigned to a specific operating area in Vietnam, and for the most part operated autonomously. Each SEAL platoon had a mobile support team (MST) boat element assigned. The MSTs were small groups of men specially trained to support SEAL operations. MSTs operated a variety of boats that included the light, medium, and heavy SEAL support craft (LSSC, MSSC, and HSSC, respectively).

SEAL Team 1 is an Arma 3 milsim unit based on the Navy SEALs during the Vietnam war. The Platoon is split into two squads. 1st from the EU and 2nd from the US. Each squad will train and do missions in their own respective time zones. Although they can work together at times.