Perhaps it is Lockheed Martin's mysterious Desert Prowler UAV. It has yet to be publicly acknowledged although it first flew in 2005.
Amongst the distinctive features of the type is the 'fat' wing chord, and a large central fuselage fairing. The aircraft engine nozzle is the same half moon shape as the Lockheed P175 Pole Cat, but the wing is not cranked on its trailing edge like the Pole Cat is.
The fuselage fairing could support a large squared off intake, but is more likely to house a large satellite communications and sensor mix. Two large blisters either side of the central fairing are likely to the intakes for a single turbofan engine.
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The large doors inboard of the main landing gear may be bomb bay doors, indicating a strike capability for the type.