QUOTE(MilitaryMadness @ Nov 4 2015, 02:37 PM)
What's the advantage this would have on regular hellfire-armed stealth UAVs?
Also what's the definition of 'suitable target'? Cruise missile are one-way weapons and its targets are usually large stationary structures or follow relatively predictable routes (like ships) which are then pre-identified and the missile is expressly programmed to attack a target that fits that particular target profile (or any secondary targets, just in case).
Cruise missiles loitering to attack a target of opportunity that just happens to pass by , say a terrorist Toyota truck full of armed dudes, that is just ridiculous. The tech that enables an autonomous weapon system to identify its own targets won't be available for a while.
If this weapon is deployed and circling the skies,what happens if no targets turns up? You can't well recover a cruise missile the way you recover a UAV. You still could recall a patrolling UAV to a friendly airstrip when it runs out of fuel. If the fuels starts to run low on this thing with no target appearing,you'll be forced to voluntarily crash or self-destruct the darn thing. Imagine a $ 1.5milllion USD weapon (the cost of a Tomahawk missile) which can't find any targets and you're forced to self destruct it?
Armed UAV require some form of logistics chain and many require an airstrip or an aviation ship to launch and recover the UAV. The UAV will require fuel and spare parts which must be be conveyed through the chain. This logistic chain and static launch bases is vulnerable to enemy interdiction effort. . This is not a problem for COIN, but it'll be a vulnerabilities in a conventional war.
Cruise missile on the other hand are almost maintenance free and can be launch from a varieties of mobile platform, like a Submarine for example. Since it's one use weapon, it'll be cheaper than UAV. The loitering capability is useful for interdiction mission. Of course, the decision to attack will be in the hand's of a human operator. When the missile detected potential target, it'll send a signal burst via satellite which contain the visual and sensor information on the target to the command center. Then the human operator will send back a signal to attack the target or not.
Regarding wasting the expensive missile, the same thing can be said about the existing cruise missile. The key here is intelligence. If your intelligence is shaky, then there's a large possibility that the cruise missile will attack a barn instead of a enemy HQ due to faulty intel. A capability to loiter will give a missile a capability to attack secondary target nearby in case the primary target doesn't appear in a allotted time frame.