marksman

VF means Variable Fighter

VF-1 Valkyrie
VF-4 Lightning III
VA-3 Invader
VF-9 Cutlass
VF-11 Thunderbolt
VF-14 Vampire
VF-17 Nightmare
VF-19 Excalibur
VF-22 Sturmvogel II

But it is commonly refer all variable figther as Valkyrie...