Assertion: squadron's role | /r/CapableOf | become on 6 december
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Source sentences:
text: The designations of the squadron changed in the late 1930s as the role of bombardment became pre-eminent in the Air Corps, becoming the 1st Bomb Squadron (Medium) on 6 December 1939, and the 1st Bomb Squadron (Heavy) on 20 November 1940.