They are all old men, so I would also assume that they are WWI Vets.
"Much that once was, is lost. For none now live who remember it."
They look like Imperial caps to me.
Best regards, Patrick
I agree--I believe they are former Husaren of the Kaiserreich wearing Imperial caps (which were probably made in the 1930s)
NEC SOLI CEDIT
The Regiment Garde du Corps, a cavalry regiment that fought in WW1 wore a white cap with red band and piping. Here's a seargeant wearing the cap circa 1912, and also a colour photo of a modern day copy for reference.
Stands a fair chance?
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.