Operation Toan Thang I was a US, Australian and ARVN operation conducted between 8 April 1968 and 31 May 1968 in the Vietnam war. Toan Thang, or "Complete Victory", was part of a reaction to the Tet offensive by forces allied with the Republic of Vietnam designed to put pressure on PLAF (Vietcong) and PAVN (North Vietnamese Army) forces.
References
Operation Toan Thang I Wikipedia(Text) CC BY-SA