Almost immediately after the completion of the runway, it became the nexus of United States Army Air Forces (USAAF) operations from Tarawa, as the runway at nearby Hawkins Field on Betio was too short for safe bomber operations. The longer runway at Mullinix became the base for the VII Bomber Command Headquarters, which directed operations against Japanese forces in the Marshall Islands. In addition, the USAAF stationed the B-24 Liberator-equipped 11th Bombardment Group and B-25 Mitchell-equipped 41st Bombardment Group at the airfield.