Premise: VP-HL-1 was a Heavy Patrol Squadron (Landplane) of the U.S. Navy. The squadron was established as Bombing Squadron 116 (VB-116) on 1 December 1943, redesignated Patrol Bombing Squadron 116 (VPB-116) on 1 October 1944, redesignated Patrol Squadron 116 (VP-116) on 15 May 1946, redesignated Heavy Patrol Squadron (Landplane) 1 (VP-HL-1) on 15 November 1946 and disestablished on 22 May 1947.
Hypothesis: the last time VP-HL-1 was redesignated was on 15 November 1946