Sentence:  “[…] if you call my duds a ‘livery' again there'll be trouble. It's bad enough to go around togged out like a life saver on a <WSD>drill</WSD> day, but I can stand that 'cause I'm paid for it. What I won't stand is to have them togs called a livery. […]” 
Meaning of the word marked with <WSD> tags:  An activity done as an exercise or practice (especially a military exercise), particularly in preparation for some possible future event or occurrence.