One leading Amateur radio manufacturer, Hallicrafters, turned a Signal Corps requirement for a self-contained mobile radio system into one of the most successful communications systems of WWII - the SCR-299. The SCR-299 was a truck or shelter mounted radio system that contained every component needed to provide long range AM and CW communications. It became the backbone of tactical communications for US armed forces on battlefields across the globe.
In 1944 the Hallicrafters company hired the famous industrial training film company, Jam Handy (yes, Jam Handy) to produce a comprehensive half-hour story on the SCR-299. Hallicrafters was rightly proud of their accomplishment and wanted to showcase it.
This movie is a minor classic in the Amateur radio world, and a must-see for anyone that ever owned, or lusted after, a Hallicrafters radio.