US Army helicopters pour machine-gun fire into the tree line to cover the advance of South Vietnamese troops as they attack a Vietcong camp near the Cambodian border, in this March 1965 file photo. (AP)

https://www.arabnews.com/news/us-army-helicopters-pour-machine-gun-fire-into-the-tree-line-to-cover-the-advance-of-south-vietnamese-troops-as-they-attack-a-vietcong-camp-near-the-cambodian-border-in-this-march-1965-file-photo-ap-828396