[2] A decorated Vietnam War veteran who served in the covert Studies and Observations Group (SOG), Plaster co-founded a renowned sniper school that trains military and law enforcement personnel in highly specialized sniper tactics.

He is the author of The Ultimate Sniper: An Advanced Training Manual for Military and Police Snipers, The History of Sniping and Sharpshooting, and Secret Commandos: Behind Enemy Lines with the Elite Warriors of SOG, a memoir of his 3 years of service with SOG.

Plaster graduated from high school in 1967 and holds a BA in Journalism from the University of Minnesota.

Plaster was initially assigned to 5th Special Forces Group[3] and served three combat tours in the Vietnam War as a member of MACVSOG beginning in October 1968, leading intelligence-gathering and recon teams in North Vietnamese Army-controlled areas of Laos and Cambodia and along the Ho Chi Minh Trail.

[4][5] He was wounded once, and decorated four times, eventually receiving a field commission in recognition of his combat experience.