MOS

Noun

 * "I was a marine. My MOS was 0311," he said.
 * "We have an MOS down," the dispatcher said.
 * "I was a marine. My MOS was 0311," he said.
 * "We have an MOS down," the dispatcher said.
 * "I was a marine. My MOS was 0311," he said.
 * "We have an MOS down," the dispatcher said.
 * "We have an MOS down," the dispatcher said.
 * "We have an MOS down," the dispatcher said.

Etymology 2
Disputed, with many speculative suggestions; see Wikipedia.

Phrase

 * 1)  Without a synchronous audio track.