ATA and IGUA extends current labor contract Published March 25, 2013 By Raquel March AEDC/PA ARNOLD AIR FORCE BASE, Tenn. -- The bargaining unit members of the International Guards Union of America (IGUA) Local 46 recently approved a one-year extension of their labor contract through March 31, 2014 with AEDC's prime contractor Aerospace Testing Alliance (ATA). IGUA Local 46 has been a part of the Arnold Air Force Base security and base protection since 1952. The AEDC security forces are recognized by the state of Tennessee as certified police officers authorized to perform all police functions similar to any municipal police force. ATA provides engineering and testing services, facilities maintenance as well as security and base protection.