The water survival test is composed of a tower jump, 25 meter swim, 25 meter pack swim, four minute water tread, and a shallow water gear shed. Recruits who experience difficulties with these events are provided in-depth training from certified swim instructors so they may meet the standard. The training for these recruits is known as "Iron Ducks."
Each recruit who successfully completes swim training will earn a Water Survival Basic (WSB) qualification. Recruits who are projected to enter MOSs with a high risk of aquatic dangers are required to complete an enhanced evaluation or risk reclassification to another MOS.