I don't know if I'd vote it the "best" burger I've ever had but the club at CVB used to have a pretty darn good bacon cheese burger with grilled onions on it.
And when I was in Guam from '85-'87 the best burger on the island IMHO was at the Andersen AFB Palm Tree Golf Course Club House. It was worth the drive.
I can remember the Best Burger I ever ate was in "Doc Zeek's back yard on base in Argentia, NFLD. I recall Dave Williams was there as well as others as we all took a turn at watching and turning amazing moose burgers on a grill outside wearing foul weather jackets. What were we thinking!!!!!
Chuck