US Air Force Reserve Command C-130H Hercules crews from 757th Airlift Squadron at Youngstown ARS, Ohio, carried out aerial spray missions over areas of North Dakota during missions from 28 May to 7 June 2013. The crews applied larvicide, designed to kill mosquitoes before they are able to fly, in order to improve working conditions and lower the risk of vector-borne illness to individuals living and working and in and around the Williston Army Corps of Engineers property in Williston, North Dakota, and at Grand Forks AFB. The aerial spray crews flew 56.3 operational hours covering 8,024 acres. The Youngstown squadron is the US Department of Defense’s only fixed wing aerial spray unit.