Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : The ARL 44s equipped the 503e Regiment de Chars de Combat stationed in Mourmelon-le-Grand and before the end of 1950 replaced seventeen Panther tanks used earlier by that unit.
Answer : 1950
Which was the official year for the approval of ARL 44?