George Jr. entered the U.S. Army late in World War II and retired 20 years later, in 1964, as an Ordnance Corps Major.

In the 1950s he began a long career as a writer on handloading and guns, and was listed in the mastheads of more than ten firearms publications.

At the time or Kennedy's death, Nonte was an Ordnance Corps Captain, stationed at Fort Sill, Oklahoma.

An investigative report by Ray and Mary La Fontaine, published by the Washington Post in August, 1994 mentioned Nonte, and alluded to him running guns with Jack Ruby, but provided no conclusive evidence.

[8][dead link‍] His eldest son, David Nonte, with the assistance of Edward C. Ezell and Lee Jurras completed the draft manuscript for his final book, Combat Handguns, which was published posthumously.