Given the task definition and input, reply with output. 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 : Including the single prototype, 141 Flakpanzer 38(t)s were built from November 1943 to February 1944, entering service in 1944.
Answer : 1944
What year is Flakpanzer 38(t) associated with?