 In 1946, the Swedish Air Force purchased its first batch of 70 FB 1 Vampires, having been looking for a jet-powered fighter to replace the outdated SAAB 21 and J 22 aircraft of its fighter force.In Swedish service, the Vampire received the designation "J 28A", it was assigned to the Bråvalla Air Force Wing (F 13).The type soon provided such good service that the Vampire was soon selected to serve as the backbone of the fighter force.