He served four years of active duty in the United States Air Force , and two years on inactive reserve status .
Erwin studied real estate at the University of Tennessee and in 1969 , became a real estate administrator for United Parcel Service .
Erwin served four years of active duty in the United States Air Force , and two years on inactive reserve status .
Erwin studied real estate at the University of Tennessee and in 1969 , became a real estate administrator for United Parcel Service .