JB-4 [SEP] service entry
What was the year JB-4 entered service? What year did JB-4 come into use? What year was the service entry date for JB-4? Which was the official year for the approval of JB-4? What year was JB-4 commissioned? What year is JB-4 associated with? What year was JB-4 introduced? In what year did JB-4 enter service? What was the year that JB-4 entered service? In which year was the service entry date for JB-4? What year was JB-4 made?
1945
-1
Section::::Operational history.

JB-4
30743425