This cover was sent in November, 1974 by Tran Thanh Tung, a Major in the Vietnamese Air Force (VNAF) 3rd Division stationed in Bien Hoa approx 15 miles north of Saigon. The air base was served by KBC 3004.
Bien Hoa was also known as Air Base 23. The number "2" indicated that it was the second air base to be established for military use. The first was in Nha Trang. Bien Hoa became the VNAF logistic support base on 1 Jun 1955. The number "3" indicated the military region.
Typically, the Vietnamese Air Force was referred to as "Khong Quan", but the return address uses the term "Khong Luc."
"V.N.C.H." is Viet Nam Cong Hoa.
"DT" or "dien thoi" is telephone number.
"Hoa Tieu" means pilot - perhaps "Lead Pilot"?
The enclosure is in regards to purchasing a used Fiat from an older gentleman on Pasteur Street in Saigon.