What DARPA doesn't need is weapons platforms, and rightly so. DARPA envisions the Navy leaving its Upward Falling technologies submerged in waters far from an actual fleet and (presumably) in areas where geopolitical hostility is at least possible if not probable. So it wants technologies that the Navy can feasibly lose without risk. After all, retrieval of unused systems would be difficult, and you certainly don't want to leave anything on a faraway seafloor that would endanger American operations if the enemy were able to locate and retrieve it. Therefore UFP is decidedly not a weapons program, even though an armed warbot emerging unexpectedly from the icy depths would most certainly drive fear into even the most formidable enemy navy.