Plumlee enlisted in the U. S. Army in April 1954 and was assigned to the Texas 49th Armored Division at Fort Bliss, Texas. He later transferred to 4th Army Reserve Military Intelligence Unit at Dallas Love Field in Dallas, Texas.
He became an aircraft mechanic after leaving the Army and obtained an airplane pilot's license in 1956, he worked as airplane mechanic at Southwest Airmotive at Dallas Love Field.
He subsequently worked as a pilot for secret CIA flights including some for William King Harvey, Tracy Barnes and William "Rip" Robertson and he flew arms to Fidel Castro in Cuba prior to the overthrow of Fulgencio Batista.
After Castro took over Plumlee then flew arms to Castro's
In 1962 he joined Task Force W Section for the Cuban Project (also known as Operation Mongoose) then run from the JM/WAVE station in Miami, Florida where he worked as both a pilot and undercover CIA CAG (Covert Action Group) operative. His code name was "Zapata". He was also a member of the Operation 40 project.
Senator Frank Church Church Committee (1975 - 1976)
Senator John F. Kerry, Kerry Committee report (1988 - 1991)
Congressman Thomas N. Downing, Chairman of House Select Committee on Assassinations
Arizona Governor Bruce Babbitt