The AJ-37 Viggen was a candidate to replace the F-104's within the KLu, but its huge fuel consumption was the most important reason to opt for the GD F-16. This early AJ-37 37017/02 in 'Splitter camo' of F6 at Karlsborg was seen at its home base. The initial AJ-37 was the attack version, the later JA-37 was more dedicated to its fighter role