The 442nd Fighter Wing's operational readiness exercise at Whiteman Air Force Base May 14 and 15, tested the limitations of the unit's A-10 "Warthog" maintainers, who found serenity within the confines of flight line shelters. Master Sergeant John Walton, 442nd Maintenance Squadron, manned one shelter from 6 a.m. to 6 p.m. in efforts to provide not