Wheeler-Sack Army Airfield (ICAO: KGTB, FAA LID: GTB) is a military use airport located at Fort Drum, in Jefferson County, New York, United States. It is owned by the U.S. Army.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, this airport is assigned GTB by the FAA but has no designation from the IATA (which assigned GTB to Genting Airport in Malaysia). However, as of November 2012, IATA (in its Location Identifier Notification #40 bulletin, 2012) claimed back the GTB code because Genting's airport could not be found.