I think it is far more likely that the problem is that the Pentagon doesn't want to buy enough platforms -- weaponized or not -- to make the market worth their

I think it is far more likely that the problem is that the Pentagon doesn't want to buy enough platforms -- weaponized or not -- to make the market worth their time. Better to sell off 1/16 of the business for some free cash flow and focus on the larger consumer market. After all, iRobot began as a DARPA contractor and already experimented with weaponized remote platforms; they aren't averse to making tools for war, they just obviously don't see enough cash in it.