and NVA and they would attempt to avoid detection by not firing on Operation Snoopy missions. (Snoopy's ability to detect smoke meant it could easily locate ground troops firing with small arms, even if under cover and camouflaged.) In later Snoopy operations, the detection helicopters were disguised as gunships in order to provoke easily detectable small arms fire. Another effective decoy used by the NVA and VC involved hanging buckets of mud with urine in trees and then moving into another area. Tactics such as these essentially rendered people sniffers ineffective in jungle terrain, but they remained useful in open areas, such as those found in the Mekong Delta. References Further reading "Sniffing Out the Enemy", Time Magazine, June 9, 1967, accessed October 24, 2008. Vining, Mike R. "A People Sniffer Operation that Went Horribly Wrong", Army Chemical Review, Summer 2008, pp. 14–15, accessed October 24, 2008. "ForgottenWeapons.com", "XM-2 Personnel Detector" Military equipment of the Vietnam War Military electronics Military sensor technology