 During the incursion itself , U.S. and ARVN ground units were supported by 9 @,@ 878 aerial sorties ( 6 @,@ <unk> U.S. / 2 @,@ <unk> Vietnamese Air Force ) , an average of 210 per day . During operations in the Fishhook , for example , the <unk> flew 3 @,@ <unk> sorties and the South Vietnamese Air Force <unk> . These tactical airstrikes were supplemented by 653 B @-@ 52 missions in the border regions ( 71 supporting Binh Tay operations , <unk> 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 were limited to a depth of 48 @-@ kilometers between the South Vietnamese border and the Mekong River . 
