Flight Cmdr. Iain "Spike" Wright, William's line manager, said he was dumbfounded by the invitation, saying it was a "great honor" and would be "quite good fun."
Flight Lt. Thomas "Sticky" Bunn, said Thursday that the Buckingham Palace-stamped invitation was "not something you see every day."
Other search-and-rescue crews will pitch in to help cover the unit's shifts while they take three days off for the festivities.
