MISAWA AIR BASE, Japan – U.S. Air Force Staff Sgt. Michael Pfeiffer, 35th Communication Squadron cyber transport systems supervisor, uses an optical time domain refelectometer to run a test on a data circuit, at Misawa Air Base, Japan Feb. 21, 2014. The OTDR emits data in the form of light from the circuit to the end user to test the quality of the fiber optic cables. (U.S. Air Force photo/ Staff Sgt. Tong Duong)
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