An officer that fulfills a non-combat support function, often in a headquarters or planning office.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "staff officer" in a sentence
"The note he sent back with Magruder's staff officer was to the effect that, as the Federals were said to be getting off, Lee expected him to advance rapidly and follow up Armistead's success.27"
"Socially, Sorrel was charming; as a rider he was the envy of many a cavalryman; at work in Longstreet's headquarters tent he need not have feared comparisons with any staff officer of the army."
"All officers above the grade of colonel at one time or another had met General R. H. Chilton, senior staff officer to Lee."