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The Defense Language Aptitude Battery (DLAB) is the U.S. Department of Defense aptitude test that measures a typical native English speaker's aptitude to learn a foreign language; it is used across the military services to qualify personnel for language training at the Defense Language Institute Foreign Language Center and for language-dependent assignments and ratings.
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Two portions — listening and reading; no section-level breakdown or item counts are published
A Defense-wide aptitude battery used by all U.S. military services at the same MEPS/testing-command network; DLIFLC reported 24,000 DLABs administered per year at the MEPS, and DLIFLC's FAQ shows both Navy and Air Force processes routing members through it
Administered to U.S. military personnel and applicants who need it: those pursuing language-dependent roles such as reclassification to the Navy CTI rating, Foreign Area Officer lateral transfer, assignment to a billet or special program requiring foreign language skills, or enrollment in a DLIFLC-taught language course