F-104s operating in Vietnam were upgraded in service with APR-25/26 radar warning receiver equipment, with one example on display in the Air Zoo in Kalamazoo, Michigan.
De F-104 der tjente i Vietnam blev opgraderet 'i marken' med APR-25/26 radar-advarsels modtageren, et enkelt eksemplar er udstillet i Air Zoo i Kalamazoo, Michigan.