Vietnam Era Rocket Packs
 

This article has some great pictures from proposals by Bell for the use of rocket packs in combat.

Check out the hover craft in the 5th picture. Look familiar?

https://paleofuture.gizmodo.com/how-...s-i-1820082814

Not surprised to see an SK-5. They were also developed by Bell and used in Vietnam. They were loud, but proved effective in certain missions.

https://upload.wikimedia.org/wikiped...%3B0096887.jpg