How many letters does the top answer for “military affairs scientist” have?

The most common answer is butler (6 letters).

Crossword clue: military affairs scientist

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

butler 6 letters wd-fact-v3

a manservant who has charge of wines and the table

jomini 6 letters wd-fact-v3

marcellinus 11 letters wd-fact-v3

military scientist 67% similar → gelfand

military history scientist 50% similar → ambrose, delbruck

military service scientist 50% similar → montagu, pavlichenko