Assertion: group's plane | /r/HasProperty | assigned to fighter interceptor squadrons
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text: Although the number of ADC interceptor squadrons remained almost constant in the early 1960s, attrition (and the fact that production lines closed in 1961) caused a gradual drop in the number of planes assigned to fighter interceptor squadrons, from 24 to typically 18 by 1964 and to 12 by 1967.