first sergeant 
noun
(In the US army) the highest-ranking non-commissioned officer in a company or equivalent unit.We assembled drill sergeants, company commanders, and first sergeants and executed leader training on each aspect of the warrior challenge....
- Conditions are further complicated by unit commanders and first sergeants not being full-time and by all having to get caught up during weekend training.
- All command sergeants major, first sergeants and first line leaders of each command are responsible for the program.
- in the first place
- in the flesh
- in the fullness of time
- in the gift of
- in the grip of
- in the gun
- in the heat of the moment
- in the heel of the hunt
- in the hole
- in the hope of
- in the interests (or interest) of something
- in the land of the living
- in the lap of luxury
- in the lap of the gods
- in the last resort
- in the light of (or in light of)
- in the line of duty
- in the long run
- in the main
- in the making
- in the mass
- in the matter of
- in the melting pot
- backscratcher
- backscratching