40mm Bofors Round Joined to 2.75" Rocket Warhead

[andrew.m_23]

Can anyone help solve this mystery? These were found on multiple occasions in Arizona. The military manufactured an inert version of this (WTU-14/B), the rounds pictured below are believed to be live (Mk 1 Mod 0 warhead). Is there any information on this or on what the purpose is of joining a Bofors round to a 2.75" rocket warhead?

 

[US-Subs]

There was a 60-series document on them at one time, years ago. Strictly TP as I recall, a Navy thing. I've never seen any live, and that would be contrary to the documentation I saw so long ago. As to why they exist, I have no idea, like so many Navy projects. I'm sure that it made sense to someone at the time. I just recently saw a variation of the warhead, first one I've ever seen. A repaint, so the markings mean nothing. Also interesting is that the type of 40mm did not seem to make a difference, I've seen them as both AP and HE (TP) models. Mine shown as a comparison.

 

[Chris]

In the TM 60-2-2-1-2 there is photo Jeff

Chris