Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Q: Context : The PTRD-41 (Shortened from Russian, ProtivoTankovoye Ruzhyo Degtyaryova; 1941 ;''Degtyaryov Anti-Tank Rifle'') was an anti-tank rifle produced and used from early 1941 by the Soviet Red Army during World War II. It was a single-shot weapon which fired a 14.5114mm round.
Question : What was the year that PTRD entered service?
A:
1941