Can you imagine the air cover and ground support needed?
You couldn't let a hostile anything within 300 miles.
Might be OK within the continental US, and even then it would be one tempting target. In hostile territory it would need a cloud of choppers and various ground attack and air defence planes.
Sort of like a big, dumb, slow aircraft carrier. What a prize.
On the other hand, with enough gas reserves, an enemy might just shoot it up.
Arf
