cable dog
n.— «Strapped into a six-point climbing harness, each Airman had to climb up the metal tower and at the 50-foot platform had to lean back and hang from the harness.…Some of the “cable dogs” as they are called, who don’t typically work on the towers, also were able to get tower-climbing recertification.» —“Comm Airmen get tower-certified” by Phyllis Hanson in Ali Base, Iraq Air Force Link Dec. 5, 2007. (source: Double-Tongued Dictionary)