Most military water survival classes demand you to tread water and fight to adapt in the water while in your uniform. The USMC RECON Screening Test Swim, which requires Marines qualifying for RECON units to swimming 500 meters in cammies, backed by a range of treading, diving, and survival abilities, is one of the most challenging swim tests available. With this, swimming and high-repetition exercises, and fast-paced cardio should be part of your everyday routine. Training your obstacle course skills, as well as your swimming technique, is highly suggested as well.
The Crossroads of Special Operations