The T-29/C-131 series of aircraft was one of the military's many cost-saving examples of purchasing existing civil and commercial designs for their utility and transport needs. The first military Conviar-Liner was accepted on 8 March 1950. Military production eventually eclipsed civil production with the last Convair-Liner built being a military Canadair CL-66B, which was delivered on 3 March 1961. This aircraft was the last of 568 military Convair-Liners.