What does U/S stand for?

U/S stands for Unfit for Service

This definition appears very rarely

Other Resources: Acronym Finder has 9 verified definitions for U/S

Samples in periodicals archive:

Unfit for Service: The Implications of Rising Obesity for U.S. Military Recruitment John Cawley, Johanna Catherine Maclean. NBER Working Paper No. 16408

The term Section 8 refers to a category of discharge from the United States military, that of a member judged mentally unfit for service. It also came to mean any...