He was Chief of the Defence Staff from 1978 to 1982 during which time the Soviet submarine U 137 ran aground in Swedish waters.

Schuback was promoted to captain and seagoing unit commander in 1974 and to rear admiral and chief of staff of the Upper Norrland Military District (Milo ÖN) in 1976.

When Schuback, as Chief of the Defence Staff, was reached by the news that the Soviet submarine U137 ran aground in Blekinge archipelago in 1981, he spontaneously exclaimed "Finally!".

[4] Schuback in his role as chief of the Defence Staff, had to recreate the Swedish anti-submarine warfare capabilities.

Schuback was also chairman of the association Friends of the Vasa Museum (Föreningen Vasamuseets vänner)[2] and was involved in the creation of the Stockholm Water Prize.