During the incursion itself , U.S. and ARVN ground units was supported by 9 @,@ 878 aerial sorties ( 6 @,@ 012 U.S. / 2 @,@ 966 Vietnamese Air Force ) , an average of 210 per day . During operations in the Fishhook , for example , the USAF flew 3 @,@ 047 sorties and the South Vietnamese Air Force 332 . These tactical airstrikes was supplemented by 653 B @-@ 52 missions in the border regions ( 71 supporting Binh Tay operations , 559 for Toan Thang operations , and 23 for Cuu Long ) . 30 May saw the inauguration of Operation Freedom Deal ( named as of 6 June ) , a continuous U.S. aerial interdiction campaign conducted in Cambodia . These missions was limited to a depth of 48 @-@ kilometers between the South Vietnamese border and the Mekong River .