the following is straight from the OCS webpage concerning exactly was is expected of every candidate as far as aquatic program / 3rd class swim qualification. There is no ambiguities here. its cristal clear.
Pre-Commissioning Swim Requirements
The Third Class Swim Test is administered early in the training program.
Candidates who have difficulties with the test will be temporarily suspended until they pass the swim test. In the meantime they will receive extra instruction and will continue with training at a later time.
Candidates who are evaluated as being unsafe in the water will be removed from training and given remedial swim training.
Candidates who are unable to successfully complete the swim test, following extensive remedial instruction, will be considered for attrition from the program.
Third Class Swim Test consists of the following:
Abandon Ship Jump: Jump from a 12 foot tower to simulate abandoning ship.
50 yd Swim: Using any single following stroke or combination of the crawl, breaststroke, sidestroke, and elementary backstroke
5 minute Prone Float: Remain afloat face down, utilizing survival floating skills, for five minutes.
Shirt and Trouser inflation: Fill a shirt and pair of trousers with air to remain afloat.
*** IN ALL EVENTS THE SWIMMER MUST APPEAR SAFE, CALM AND RELAXED ***