In addition to military academies and Reserve Officer Training Corps (ROTC), the United States military services draw a significant number of officer trainees from the military enlisted ranks and from civilian college graduates, commissioning them as second lieutenants or ensigns after completing Officer Candidate School (OCS) or Officer Training School (OTS) programs. This brand-new manual prepares candidates to pass the acceptance tests for those schools. It presents in-depth reviews of all test topics, which include math knowledge and reasoning, word knowledge and reading comprehension, and general science. Specialized topic reviews include mechanical and spatial comprehension and flight aptitude. Full-length practice tests are as follows: two Air Force Officer Qualifying Tests (AFOQT); three Army/Marine Corps OCS test; and three practice tests for Navy OCS and Marine Corps/Coast Guard Aviation applicants. All tests come with answer keys.