[CoyoteGestalt]

I used it once for cops as a generic "knowing how to operate and stow your basic gear" skill, as I needed something they could roll against to represent that knowledge, and to differentiate the street-level uniformed cops who had it from both senior desk-bound folks and investigators from other agencies, who didn't.

(Obviously, this came with the assumption that it only applied to police gear, and would take heavy familiarity penalties or be entirely non-applicable to actual soldiers' equipment and functions, if that had ever come up.)