Leó Szilárd and Enrico Fermi patented the idea of a nuclear reactor in 1933. The military didn't invent it.
Christian Hülsmeyer was a German inventor and entrepreneur. He was the first to use radio waves to detect "the presence of distant metallic objects"; he got a patent for his "Telemobiloscope" in 1904. The military didn't invent it.
The first patent for using a gas turbine to power an aircraft was filed in 1921 by Frenchman Maxime Guillaume. This predates the RAF's patent by 11 years.
Richard Drew invented Scotch tape and masking tape in the 1920s. In 1927, J&J invented cloth tape for medical uses. So far no military involvement. Then in 1943, Vesta Stoudt, an ordnance factory worker, thought to add waterproof plastic to J&J's cloth tape, making the first duct tape, and that's the extent of the military involvement. Duct tape was later improved in 1960 by an HVAC engineer by making it flame resistant. Seems that the military role in developing duct tape was rather minimal, and would have been made eventually by the free market.
There are serious issues trying to pin down who invented the first gunpowder rockets and for what purpose. Seems likely gunpowder was invented by Taoist alchemists seeking an elixir for immortality, and that the very first application of gunpowder rockets was fireworks for entertainment.
Writing for the WSJ in July 2012, Gordon Crovitz questioned "Who Really Invented the Internet?" at http://online.wsj.com/news/articles/SB1000087239639044446430...