Detailed Instructions: You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.
Q: 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.
Subject : ARL 44
Relation : service entry
A:
Which was the official year for the approval of ARL 44?