"The 757th Airlift Squadron was on an Active Duty Mission from the 1940's to 1973. The unit was assigned to the USAF Reserve in 1973.

The unit relocated in 1992 from 907 AW Rickenbacker ANGB OH to 910AW at Youngstown Air Reserve Station, OH.

The mission of the 757th Airlift Squadron is to maintain a large-area fixed-wing aerial application capability to control disease vectors in combat areas and on DoD installations; to maintain a large-area application capability to control vegetation and pests of vegetation on DoD installations; and to provide aerial spray training.

The unit is also tasked with:
To serve as the DoD Training Center for the only EPA-approved Federal Aerial Application Pest Control Certification Course.
To conduct operational testing of new pesticides, equipment and techniques.
To provide consultation services concerning aerial applications to all DoD organizations for routine, emergency and contingency projects.
To maintain DoD's aerial dispersal literature repository and computer deposition modeling capability. (...)"
http://www.globalsecurity.org/military/agency/usaf/757as.htm