Canvas:
In the military, any Minister of any religion can be considered a Chaplain, not just a Catholic Priest.
In hospitals, there are various systems. In my area (pre-covid), people in hospital or nursing homes are visited on Sundays by people with Communion in a pyx (very often these are EMHCs - laypeople). My Parish has a “Duty Priest” every day. Part of those duties involve making the rounds at the local hospital to hear confessions or perform Anointings, as well as provide Communion. I think it is probably rare that a Priest will say a whole Mass in a hospital room .
Just for the heck of it — I’d never thought about this until tonight — would it ever be permissible for a non-Catholic (or even non-Christian) chaplain, as in the military, to be an extraordinary minister of Holy Communion? Of course, it wouldn’t be the norm, but in a case of extreme necessity, what exactly would be the obstacle? Non-Christians can baptize validly, and administering communion doesn’t require any priestly powers, otherwise laypeople couldn’t do it. I suppose in such drastic circumstances, having someone place the ciborium on the altar and allowing the faithful to self-communicate (as eremitic monks did) would also be an exception that could be made in those circumstances.
I do recall that Father Mulcahy on MASH once performed a
bris — don’t recall if one of the surgeons actually served as the
mohel, I’d hate to think of someone not skilled in surgery “giving it the old college try”, considering what is involved

— but I’m not sure if this was just artistic license, or if military chaplains can actually administer the rites of religions not their own. (Obviously a chaplain without apostolic holy orders couldn’t confect any of the five sacraments for which priestly powers are needed.)
“MAS*H” Life with Father (TV Episode 1974) - IMDb