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Related to muster out: muster up
1. To leave or resign from the military. My father served in the Marines for twenty years before mustering out in 1993.
2. To discharge someone from the military. In this usage, a noun or pronoun can be used between "muster" and "out." He sued the Navy after he was mustered out in the late 80's for his sexual orientation. They threatened to muster him out if he revealed the information to the public.
muster out of something
to be discharged from military service. He mustered out of the service before his time was up. I want to know how I can muster out too.
1. To discharge someone from military service. Used chiefly in the passive: The last of the soldiers who fought in that battle were mustered out last week.
2. To be discharged from military service: I mustered out last month, and I'm proud that I had the chance to serve my country.