Your crew should be safe(r) as long as they wear a mask (aka 'face-mask') and maintain a six-foot anti-social distance.
These are the official dictates... science.
Do not question it.
.
How many of their inoculation series did they get?
How prepped are they to double-mask?
Are their double-masks in different colors so OfficialsAndAuthorities can determine submission at a glance?
'At a glance' means 'without violating anti-social distances'.
.
As long as they can furnish inoc documents, they should be safe(r).
To be safe(r), should they get re-inoculated?
Should you ask at your local branch of the Surge Patrol?
.
Various versions of inoc dictates change hourly.
Verify your
destination dictates prior to departure.
Nobody wants to save for years for a dream
vacation, then spend those precious hours in
medical quarantine prison!
Especially at several hundred dollars a day.
.
Up-date your crew inoculations.
Carry your inoc docs.
Be safe(r)!