 However, with funding limited only eleven weapons of this caliber could be deployed by 1927; one on a disappearing carriage, four 16-inch howitzers, and the remainder in batteries similar to the 12-inch weapons, all at new forts except the disappearing weapon.The Navy provided twenty 16-inch guns intended for cancelled battleships in the 1920s; six of these were deployed in Hawaii and Panama by 1935.In 1938 construction began on two casemated batteries for guns near San Francisco; the casemates protected the guns against air attack.