If you're planning to join the military, you'll have to take the Armed Services Vocational Aptitude Battery, or ASVAB. Your score on four of the ASVAB's subtests — Word Knowledge, Paragraph Comprehension, Mathematics Knowledge, and Arithmetic Reasoning — determine whether you qualify for enlistment. Together, they're called the Armed Forces Qualification Test, or AFQT. Those four subtests, along with the other five subtests, will also determine which jobs will suit you best once you're in.

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Angie Papple Johnston joined the U.S. Army in 2006 as a Chemical, Biological, Radiological, and Nuclear specialist, ready to tackle chemical weapons in a Level- A HAZMAT suit. She's currently the CBRN noncommissioned officer-in-charge of an aviation battalion in Washington, D.C.

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