![NSA/CSS on X: "During the Vietnam War, the Army used PRD-1 direction- finder with an R395 receiver to find the direction of enemy radio transmitters. They were dangerous to use in the NSA/CSS on X: "During the Vietnam War, the Army used PRD-1 direction- finder with an R395 receiver to find the direction of enemy radio transmitters. They were dangerous to use in the](https://pbs.twimg.com/media/Dm-zEkAX4AATiLY.jpg)
NSA/CSS on X: "During the Vietnam War, the Army used PRD-1 direction- finder with an R395 receiver to find the direction of enemy radio transmitters. They were dangerous to use in the
![They Assumed the Enemy in Vietnam Was Incapable of Intercepting Radio Communications. They Were Wrong They Assumed the Enemy in Vietnam Was Incapable of Intercepting Radio Communications. They Were Wrong](https://www.historynet.com/wp-content/uploads/2022/10/Platoon-Commander-US-Marine-using-radio-during-operations-Vietnam-1967-WINTER-VIEP-23.jpg)
They Assumed the Enemy in Vietnam Was Incapable of Intercepting Radio Communications. They Were Wrong
![War and Peace show, England. Vietnam war re-enactment. American field radio with three smoke canisters, two red, one yellow, on back, plus field pack Stock Photo - Alamy War and Peace show, England. Vietnam war re-enactment. American field radio with three smoke canisters, two red, one yellow, on back, plus field pack Stock Photo - Alamy](https://c8.alamy.com/comp/FJ3D0T/war-and-peace-show-england-vietnam-war-re-enactment-american-field-FJ3D0T.jpg)
War and Peace show, England. Vietnam war re-enactment. American field radio with three smoke canisters, two red, one yellow, on back, plus field pack Stock Photo - Alamy
![The very end of Vietnam. Radio telephone operator with 2/1st Infantry, 196th Infantry Brigade, November 1971 - May 1972. : r/Impression_Kits The very end of Vietnam. Radio telephone operator with 2/1st Infantry, 196th Infantry Brigade, November 1971 - May 1972. : r/Impression_Kits](https://i.redd.it/the-very-end-of-vietnam-radio-telephone-operator-with-2-1st-v0-fpslmh56reha1.jpg?width=1652&format=pjpg&auto=webp&s=385446d4f5d3f1d239a330aa56dc4d4d65a9d1ab)