YP-59 was never in combat, unless someone has an obscure reference they'd like to share. I'm not sure if any were even over sea's during the war.
An interesting story in the June 1945 edition of "Impact" has a 1 page write-up (with photo's) of 2 XP-80A's giving service demonstration flights in Italy. There's a nice photo of the two in formation flying past Mount Vesuvius. Too bad it wasn't in squadron strength and saw combat.