NAVY
Graduation and commissioning as a U.S. Navy ensign leads to service in one of four Navy warfare communities:
surface, submarine, aviation, or special warfare/explosive ordnance disposal.
Assignments are made at the beginning of your senior year.
MARINE CORPS
Graduation and commissioning as a U.S. Marine Corps second lieutenant leads to service in one of three elements:
air combat, ground combat, or logistics.
Assignments are made after commissioning, while attending The Basic School.