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.

[Q]: Context : Ralph H. Spanjer (September 20, 1920 -- February 8, 1999) was a Major General in the United States Marine Corps. 
Question : In what military branch did Ralph H. Spanjer serve?
[A]: military branch


[Q]: Context : The BMP-3 is designed and produced by the Kurganmashzavod (``Kurgan Machine Building Plant'') some variants however are built by the Rubtsovsk Machine Building Plant (RMZ), for example the BRM-3K. 
Question : What year was BMP-3 introduced?
[A]: service entry


[Q]: Context : The film is based on the actual foiling of a train robbery by Dick Gordon as related by Paul Leicester Ford in his book The Great K & A Train Robbery originally published as a serial in Lippincott's Monthly Magazine in 1896. 
Question : What is the name of the director of The Great K & A Train Robbery?
[A]:
director