Yuma Crossing
Immediately after the Mexican–American War in 1848, the U.S. Army built Fort Yuma here to protect travelers from Indians raiding the area. It was the center point of conflict in the Yuma War of 1850–53. From 1864–1890, the fort and nearby facilities was the main army base to support the US Army's efforts to control the Indians throughout the greater southwest.
Yuma International Airport
In September 1946, Yuma Army Air Field was scaled back and declared a surplus. The civilian portion of the field was returned to County, who again referred to it as Fly Field. The Chamber of Commerce promoted the City of Yuma airplane's famous endurance flights, which highlighted the region's weather which was very conducive to flying. This was a topic of particular importance to the military. The Airport became very active as a military facility during the Korean War, and was used extensively by the U.S. Air Force. In early 1951 the County Supervisors received a Department of Defense proposal to lease the airfield as a civilian-operated military training base with specific military and civilian sides. The Yuma County Board of Supervisors gave the U.S. Air Force a right of entry and in 1956 the field was named Vincent Air Force Base.