I think the talking grenades that tell you what they are going to do was "Rogue Trooper" in 2000AD, from memory the Heinlein ones were the nuke's that counted down. You knew you couldn't get away while they were telling you how long you had to live.
Not read the book for a while so may be wrong, won't be the first time, doubt it will be the last.
Any one for a genetic trooper army ala "Rogue Trooper"? Is it a pre-massacre formation or the god like Rogue himself? How do you stat up an army of 1 with self aware equipment?