Still, if you have a source for that handy, putting it on record here might be useful.
I think that's a perfectly sensible request, to which I can't really provide a satisfactory, clear-cut answer.
But visiting armed forces personnel at not free to carry weapons as they, or their CO, wishes outside of their bases in the UK.
There's over 72 years of history for anyone to look for contrary evidence!
There is a "Status of Forces" agreement between the US and UK that details under what circumstances US military personnel may be armed and their rules of engagement. As you'd expect, those RoEs are not made public for security purposes.
"Friendly Forces" stationed in the UK are governed by the Visiting Forces Act of 1952
https://www.legislation.gov.uk/ukpga/Geo6and1Eliz2/15-16/67/contents
British troops "on stag" (security duties) in the UK can't wander off-base with service weapons on their own recognisance. The same applies to non-UK forces (e.g. the USAF Security Police and Col. Halt from RAF Bentwaters).
Civil society in Britain is largely gun-free. Most police officers receive
no use-of-firearms training.
External Quote:
The proportion of armed officers to unarmed officer has remained stable over the last 4 years at around 5%. There was a fall of -0.3% to 5% as of March 2020.
From (UK)
Home Office, Police use of firearms statistics, England and Wales: April 2019 to March 2020
(same source). -This (obviously) includes London. Scotland, NI have their own figures but are proportionately similar IIRC.
There might be circumstances where, say, USAF Security Police could lawfully leave a UK base without prior arrangement while armed, but I have no knowledge of those. A strictly hypothetical scenario might be having "eyes on" armed assailants who have seized powerful weaponry. More prosaically, no-one would criticise servicemen escaping e.g. fire or a vapour hazard from an accident for retaining control of their arms. As Duke has implied, those here who might know details probably can't share them.
In the event of war with the Warsaw Pact in the 1980s, the UK government would probably have enabled the Emergency Powers Act, and the legal status of US forces in the UK might have changed. It would make more sense to engage enemy forces- Soviet
desant teams, maybe fifth columnists- as far away as possible from the resources being defended.
The United States hosts many foreign service personnel, admittedly mainly for training/ liaison/ exchange purposes (not formed units on an active deployment). However welcoming the local community might be, eyebrows might be raised if a foreign contingent left their accommodation, armed, to investigate lights in the woods
outside their base that they couldn't explain! (It's still a bit strange if they're unarmed).
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...which makes me think they were not alarmed at all by the sighting.
TBH I think you're right (in the sense that most were not alarmed by the reported sightings).
There is no record of any base-wide alert or any stand-to of off-duty Security Police that we know of on the 26th.
Despite initial concerns about a downed aircraft, no-one contacts the 67th Air Rescue and Recovery Sqn., all of 4 km away; no-one alerts the local fire or ambulance services.
The RAF (in effect USAF) Bentwaters Law Enforcement Desk contacts the local civilian police, much as they might do for a brawl in a pub or a traffic accident involving their personnel.
Surely the Law Enforcement Desk, certainly the Central Security Center, had secure links to the UK Ministry of Defence (and armed MoD Police) and RAF? As well as RAF Police, the RAF had/ has the RAF Regiment, which operates in small highly mobile units to defend airfields.
A very small number of Security Policemen, mainly new to the area, see strange lights on the night following Christmas Day.
Three pursue those lights, only one (Penniston) doesn't agree that the lighthouse was at least possibly partly responsible.
Penniston is the only one described as agitated in his responses to his line-of-command officer.
The following night, Col. Halt leads a small party to investigate an apparent recurrence of the lights.
Again, there is no stand-to of base Security Police. Personnel at RAF Woodbridge are not alerted.
Halt goes on to send his infamous memo; the object he describes as having been seen is the object described by Penniston in his 02 January statement.
Meanwhile, for local people and the majority of personnel at RAF Bentwaters and RAF Woodbridge- and their families- life, and work, continued as per usual (to the best of our current knowledge).