Having recently attended DNBCC, where, I seem to recall, they said there was not the cash for a reprint of V3 and that V4 is not being used by the Army.
I have two copies of V3 - I did have to raid the pamph' store to find those. Unfortunately, V3 is bound and so falls apart if you open more than once or twice. Now I acknowledge that for most of the Army that gives V3 a life span measured in years, however, as a sad NBC type mine has fallen apart. I ended up producing an admendment sheet for my unit so those with V2 could update it to V3.