81M and 3M

[jvollenberg]

Now here is a question that is probably pretty basic, but something I haven't thought of before.

Why did some US mortars have 81M & 3M on them?

They are 81MM mortars, but the 3?

Any ideas?

Joe

 

[MINENAZ16]

I assume to indicate the round could be used in different launchers.



Found this on google :






Tm9-1901 :