Contract environmental well drillers drill a water well on the ramp of the 120th Airlift Wing in Great Falls, Mont. Sept. 21, 2017. The wells will be tested and monitored for contaminants as part of the ongoing Installation Restoration Program on the Montana Air National Guard base. ( Air National Guard

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Keywords: 120th, air, airlift, america, armed, defence, employee, federal, forces, government, guard, military, montana, national, service, states, united, usa, wing