Not if she's not getting off the bus.
There are public roads that cross military installations but no ID check and no requirement to disarm (if carrying a gun in the car) while on those roads.
They can check IDs for those disembarking on the Federal Center Grounds but no need while traversing.
So it's impossible to get off a bus before it reaches the exit gate of the facility?
She's on the facility, she shows her ID.
If you're on a military facility, even on a road through the facility, you're SUBJECT to a stop, but it won't always happen.
From the Denver Federal Center website:
Safe & Secure
In order to make this facility safe for you and those who work here, we request that you comply with the following guidelines:
- Please be prepared to present a valid drivers license and current vehicle registration at the gate.
- For your safety, seat belts are required to be worn at all times.
- Only service animals used to assist handicapped persons are permitted.
- Firearms/explosives are not permitted on the DFC (carried or possessed), except for official purposes.
- Narcotics are prohibited on the facility.
- Alcoholic beverages are prohibited from all areas of the facility with the exception of the softball fields, and only canned beverages are permitted.
- Smoking is prohibited in all buildings. Designated smoking areas are provided.
- Private or commercial solicitation is not allowed on the facility.
- Please secure bicycles only to racks at building entrances.
- Vehicles may be subject to inspection upon entrance. For your protection, closed circuit television cameras monitor the DFC at all times.
Please drive in a careful and safe manner at all times and comply with signals and directions of the Federal Protective Officers.
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Sounds like it is considerably more restricted that your typical public road.