Any person who served on active duty in the Armed Forces of the United States and was discharged or separated from active duty under conditions other than dishonorable and further had served such active duty for more than ninety (90) days, other than for training purposes, any part of which occurred after January 31, 1955, or was released from active duty after January 31, 1955, for a service-connected disability, shall be entitled to tax exemptions, fees, special permits and veterans' preferences for state employment on the same basis as “war veterans” except as provided in Section 840.15 of Title 74 of the Oklahoma Statutes.