There is no minimum IQ score to join the U.S. Army, but applicants have to score at least 31 on the Armed Forces Qualification Test. This test is part of the Armed Services Vocational Aptitude Battery, which measures several areas, such as general science, mathematics, language capabilities and mechanical comprehension.
The results from the Armed Services Vocational Aptitude Battery also determine the Military Occupational Specialties for which applicants qualify. Candidates can take the test at a Military Entrance Processing Station along with an extensive physical medical evaluation. Applicants need to be a minimum of 17 years of age, be a U.S. citizen or resident alien, and have at least a high school diploma.