It's a common thing for non-military types to be confused by the military acronyms. And believe me, there's a TON of military acronyms. The Army FM (Field Manual) 101-5-1 (which was recently superceded) has a dictionary of acronyms. It's about 250 pages and is incomplete by about 40%.

MOS is Military Occupational Specialty, an alpha-numeric job classification number. Different services code differently for the same job which only adds to the confusion. For instance, the job title Infantryman in the Army is 11B, in the Marine Corps it's 0311. To make it even more confusing there are trailing alpha-numeric characters in the Army system, the Skill Level Identifier (SLI) and Additional Skill Identifier(s) (ASI) For a list of ASI's click here. My sig shows that I am a 37F3H - 37F is Psychological Operations, the 3 is my skill level (3 is E-6/ Staff Sergeant) and the H is an ASI indicating that I am instructor. Even worse, the Army has recently changed all of the ASI's from alpha-numeric to numeric only, so technically my H should be an 8.

ASVAB is the Armed Servies Vocational Aptitude Battery. It's a series of tests to check the level of education in certian skills. The military has pre-requisite ASVAB test scores for different jobs. For instance there's a GT (General Technical) Score (most jobs refer to this number), an ST, GM, etc.

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