A S.A.F.E. vehicle advertises congressional candidate Carrie Buck's campaign at a 4th of July parade in Boulder City. (Photo courtesy of a parade attendee)When Nevada State Senator and Republican congressional candidate Carrie Buck paraded around Boulder City on the Fourth of July, it was on a truck belonging to a Nevada-based defense contractor who admits he colluded to defraud the U.S. government. John Buscema, the owner of S.A.F.E. Structur…