The VF-1S Valkyrie was a 3-mode variable fighter assigned to commanding officers of Veritech squadrons.
VF-1S Strike Valkyrie Battroid Ichijo Movie Version
The prototype number 001, Skull-One, was originally designated the YF-1.
Roy Fokker flew it during the First Robotech War until his death, and it was then flown by Rick Hunter.
It was the last known surviving VF-1S aboard the SDF-1.
In 2015, the Skull One, the oldest surviving VF-1 in the Robotech Defense Force, was dismantled to aid in the research of the next-generation of Veritech fighters.
Jack Archer was also assigned a VF-1S during his final fights with Zentraedi.