Recruits stand at attention and receive their Navy ball caps during a capping ceremony after completing training aboard USS Trayer (BST 21).

GREAT LAKES, Ill., (May. 24, 2007) Recruits stand at attention and receive their Navy ball caps during a capping ceremony after completing training aboard USS Trayer (BST 21). Battle Stations 21 is the culmination of all training received at the Navys only boot camp. It is a grueling 12-hour test of a recruits skills in several shipboard evolutions, including fighting fires and stopping floods. The event is held entirely aboard Trayer and marks the recruits final rite of passage into the Navy. U.S. Navy photo by Scott A.Thornbloom File# 070524-N-8848T-040