 In the III Corps Tactical Zone , Operation Toan Thang 44 ( Operation <unk> <unk> ) , was conducted by the 1st and 2nd Brigades of the U.S. 25th Infantry Division between 6 May and 30 June . The targets of the operation were Base Areas 353 , 354 , and <unk> located north and northeast of Tay <unk> , South Vietnam . Once again , a hunt for COSVN units was conducted , this time around the Cambodian town of <unk> and , once again , the search was futile . During its operations , the 25th Infantry killed 1 @,@ <unk> PAVN and NLF troops while losing 119 of its own men killed . 
