Question about promotion of enlisted by other forces

Can officers in one country’s armed forces promote an enlisted person in another country’s armed forces?

Consider the following scenarios:

An American force in Afghanistan, commanded by an American officer, have a British officer (field, not staff) with them. They come under fire and the American officer is killed, as are the sergeants. The British officer takes command and needs a sergeant, so on the spot he promotes someone.

A large group of American and British POWs are in a German POW camp in WW2. There are no Allied officers, but numerous sergeants of the same rank. Can the German commandant promote one of the sergeants to Sergeant-Major?

On a related issue, in WW1 and WW2, were recommendations for medals for those in captivity passed across lines (likely via the Red Cross) and honoured and presented?

[QUOTE=Quartz]
Can officers in one country’s armed forces promote an enlisted person in another country’s armed forces?

Consider the following scenarios:

An American force in Afghanistan, commanded by an American officer, have a British officer (field, not staff) with them. They come under fire and the American officer is killed, as are the sergeants. The British officer takes command and needs a sergeant, so on the spot he promotes someone.

[/QUOTE]

No, but he can probably say: “You! Take command of your squad!” and that will be that. He doesn’t need to actually promote someone to get the job done - if he’s in charge, he can delegate whatever he wants to whoever he wants. You don’t need to outrank someone to give him orders

Afterwards, if his own chain of command sees he did a good job, a promotion may be in order.

[QUOTE=Quartz]
On a related issue, in WW1 and WW2, were recommendations for medals for those in captivity passed across lines (likely via the Red Cross) and honoured and presented?
[/QUOTE]

Yes, a New Zealander recieved a VC on the recommedation of a german U-boat commander.