Hi and welcome to Rootschat!
The uniform, no clue...you might try posting this on the Armed Forces board. Change the file name or it won't post, just change a letter or two.
The lady, however, is wearing a very short-lived style of blouse and skirt. The skirt came out just before the war, 1913ish, and fashions didn't change much during the war. But her blouse isn't quite up to date, if she was fashion-conscious...the v-necked blouse did come out in 1913. So, I suggest the photo is slightly pre-war to early war. Definitely WWI though.
Cheers,
China