U.S. Navy S.E.A.L. Teams are usually 12 Team Members since Basic Underwater Demolition, S.E.A.L. (BUD/S) School.
The 12 Team Member S.E.A.L. Team consists of Two Fire Teams of 6 Team Members each.
After each Mission, Resupply, Rearm, Refuel, a lesson learned after the Democrat President Clinton Disaster 1993 Battle of Mogadishu, as U.S. Military Forces ran out of ammunition.
S.E.A.L. Team Members considering leaving the U.S. Navy S.E.A.L.s are interviewed by the Commanding Officer, usually requested that the S.E.A.L. Team Member go on 30 Days Leave to have time to reconsider. By the time they get to the S.E.A.L. Teams the U.S. Navy has invested lots, and after being on the Teams for a while, they are nearly irreplaceable. After the 30 Days of Leave, the Team Member usually has another Commanding Officer's Interview, if the Team Member still wants to leave the Teams a Psychological Evaluation.
After all the U.S. Navy invested in the S.E.A.L. Team Members the U.S. Navy does not want a Mass Exodus. Average amount of time to create a Fully Qualified U.S. Navy S.E.A.L. including Actual Mission Experience, 10 to 15 years, average age of Fully Qualified S.E.A.L. Team Members age 35, the Members of USNDEVGRU. The above is true for the U.S: Army Special Forces, U.S. Air Force Special Operations Wings Special Tactics Teams including METT, U.S.M.C. MARSOC wanting to leave the Teams.