Cannon behind the scenes: masters of maintenance

U.S. Air Force Senior Airman David Woliver, 16th Aircraft Maintenance Unit aircraft hydraulics systems journeyman, works on the utility system hydraulic vent line filter aboard the AC-130H Spectre gunship at Cannon Air Force Base, N.M., Oct. 25, 2011. This gives the crew the ability to indicate whether there is a potential danger in the system based on fluid levels within the reservoir.