The R-11 Refueler replaced the R-9 Refueler as the primary mobile refueling vehicle for The United States Air Force. There are currently three models of the R-11. The first generation was delivered in 1989 to the Air Force by the Oshkosh Truck Corporation and is commonly referred to as the Oshkosh R-11. The Air Force purchased 1,250 Oshkosh R-11s between 1987 and 1991. Deliveries of the second generation R-11 began in 1994. The contract for the second generation model was awarded to the Kovatch Corporation, and the pumping and dispensing systems are mounted on a Volvo chassis. These models are commonly referred to as the Volvo R-11. Deliveries of the third generation R-11 began in 2004. The contract for this model was also awarded to the Kovatch Corporation, and the pumping and dispensing systems are mounted on an International chassis. This model is commonly referred to as the International R-11. There is a new specification that has been manufactured by ATAP, Inc. R-11 fuel tanks hold a maximum capacity of and are able to issue fuel at a rate of per minute. See also List of military vehicles External links Oshkosh Trucks http://fuel.kovatch.com/ProductDivisions/FuelTrucksDivision.aspx Oshkosh R-11 photos: , Military trucks of the United States Oshkosh vehicles Vehicles introduced in 1989 Military vehicles introduced in the 1980s