Steve Leadore, right, an equipment technician for the Joint Service Aircrew Mask-Fixed Wing (JSAM-FW) research team, watches as U.S. Air Force Staff Sgt. Alex Whalton performs a mid-ear equalization maneuver while wearing an M-53 mask, part of the JSAM-FW system, during a field assessment at the 167th Airlift Wing, West Virginia Air National Guard unit in Martinsburg, W.Va., Dec. 7, 2011. The research team was working on the development of a joint service aircrew mask.