A decommissioned World War II-era destroyer docked near downtown Buffalo in New York is taking on water and listing...
Under Water Swim Stroke - breakdown.
Kick off the wall
Repeat - double arm pull, GLIDE - kick and recover - GLIDE
Kick can either be a scissor kick or a breast stroke kick BUT when swimming with fins you need to learn scissor / flutterkicks.
Kick hard / pull hard = glide fast.
Related article: The Challenges of Passing Military Swimming Tests
You don't have to be a competitive swimmer to ace Spec Ops Training, you just need to be good and comfortable in the water.