FAA Regulation

filed a IFR flight plan. received prior authorization from the controlling agency.  received prior permission from the commanding officer of the nearest military base.

No, 14 CFR Part 107 only applies to sUAS weighing less than 0.55 lbs. Yes, there is no lower weight limit for operating under 14 CFR Part 107.   No, roof ...

They can maintain line of sight and without loss of control.  They briefed each other before the flight. They are in radio contact the entire time.

The applicant must have logged 20 hours of flight time. The applicant must be a US Citizen. The applicant must be at least 16 years old.

Civil and public aircraft operations. Public and military operations. Civil operations. 

must not cause injury to a human being equivalent to 11 ft-lb of kinetic energy.  must have an approved type certificate issued under Part 21. must not cause injury to a ...

Yes, as long as it meets Remote ID requirements. No, it is not permitted.  Yes, it is permitted without limitations.

Equip the aircraft with a remote ID broadcast module. You must purchase a new drone to comply with Part 89.  Older drones are grandfathered in and don’t need to comply with Part 89.