TASK DEFINITION: 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.
PROBLEM: Context : The AK-63 (also known in Hungarian military service as the AMM) is a Hungarian variant of the AKM assault rifle manufactured by the Fegyver- és Gépgyár (FÉG) state arms plant in Hungary. 
Question : What year did AK-63 come into use?

SOLUTION: service entry

PROBLEM: Context : In cryptography, the IDEA NXT algorithm (previously known as FOX) is a block cipher designed by Pascal Junod and Serge Vaudenay of EPFL (Lausanne, Switzerland). 
Question : Which is the basis of IDEA NXT?

SOLUTION: based on

PROBLEM: Context : Stephen L. Bettinger (April 28, 1924 -- December 4, 2010) was a United States Air Force flying ace during the Korean War, shooting down five enemy aircraft in the war. 
Question : What military branch was Stephen L. Bettinger associated with?

SOLUTION:
military branch