Claes was foreign minister of Belgium from 1992 until 1994, and secretary general of NATO from 1994 until 1995, when he was forced to resign because of allegations of corruption related to improper contracts for Agusta helicopters approved by him while he was minister of economic affairs. For that he also lost his civil rights for numerous years.

Can we draw the following conclusion?
NATO Secretary General Willy Claes resigned.
yes