I loved these photos - thank you for posting them! Is it bad that the first thought I had was looking at the guy on the left and thinking 'those braces would be great for a customised white-shirted 1940's guy'
In answer to Justindo's comment about red trim and chevrons, perhaps they are just very mobile artillery troops? (I'm imagining them galloping up, towing their cannon... um... no...maybe not!)