TESTING THE LINE U.S Air Force Senior Airman Erin Gilmore, a voice network systems journeyman assigned to the 1st Communications Squadron, uses a buttset to test a newly connected line equipment number at Langley Air Force Base, Va., Feb. 21, 2007. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 375897-K-KKQ15-723.jpg Photo Gallery