instruction:
Classify the relation of question with context to one of these categories: 1) award received, 2) based on, collection, 3) conflict, 4) constellation, 5) convicted of, 6) date of death, 7) director, 8) drafted by, 9) educated at, 10) medical condition, 11) military branch, 12) narrative location, 13) occupation, 14) original network, 15) parent company, 16) point in time, 17) production company, 18) residence, 19) series, 20) service entry, 21) sex or gender, 22) spouse, 23) standards body question.
question:
Context : Hiram Burnham (1814 -- September 29, 1864) was an officer in the Union Army who commanded a regiment and then a brigade in the Eastern Theater of the American Civil War. 
Question : What military organization did Hiram Burnham belong to?
answer:
military branch


question:
Context : Kujava Radinović was the second wife of King Stephen Ostoja of Bosnia and as such she was Queen of Bosnia from 1399 to 1404 and again from 1409 to 1415. 
Question : What is Kujava Radinović's spouse's name?
answer:
spouse


question:
Context : In 1961, the first M79 grenade launchers were delivered to the US Army. 
Question : What year was M79 grenade launcher introduced?
answer:

service entry