I downloaded pic. 7 and blew it up to 150%. Sentry at left in WWI European uniform. Officer has collar tabs denoting 'staff' but he's not a general. Armband appears to be two colours, no idea what it denotes. Pic. is probably 1919 at earliest.
Pic 6, no rank or regimental badges. Just the badge on the epaulettes. He has officer status but some specialist function, don't know what. Lady is the clue, blouse and pleated skirt. More 1940's, maybe as late as 1950. Have to wait for a fashion expert's opinion.