FAA Order 8130.2M — Operating Limitation 3
Appendix D · Table D-1 · p. p168
The addition of weapons or special military mission systems is prohibited. Flights related to providing military services or flights for which no civil regulatory framework exists (for example, air combat maneuvering, air-to-air gunnery, target towing, electronic countermeasures simulation, cruise missile simulation, and aerial refueling) are prohibited under this airworthiness certificate. These activities are inherently military, not civil activities.
Verify it yourself: the eyeball above opens the exact page of Order 8130.2M with this limitation highlighted.