The bestselling ASVAB study guide--now updated for 2018/2019 The ASVAB (Armed Services Vocational Aptitude Battery) is a timed multi-aptitude test developed and maintained by the Department of Defense. The test is given at more than 13,000 schools and Military Entrance Processing Stations nationwide and is used to determine the branch of service and career field where a candidate would most excel. If you're one of the more than one million people...