This irks me SO much to read all the posts asking whether or not their groom should wear his class A's (dress greens) because of the color or they don't like them blah blah blah.
I want you all to realize that the greens are technically a DUTY uniform, just as he wouldn't wear his ACUs to his own wedding, he shouldn't be wearing his A's either. The Army Times recently ran an article about how the greens are now the official uniform in non-field environments, a lot of offices on base are now requiring greens think of it like wearing a suit to work instead of jeans.
AR 670-1 States that the "Class A" Army Green Service Uniform is acceptable for informal social functions in addition to daily duties. Conversely, the Army Blue Uniform is for formal functions.
If you aren't interested in dress whites (which are never worn otherwise and pretty much a waste of money) then have your fiance invest in some dress blues. He can wear them for the rest of his career and the color is much more flattering at a wedding, not to mention one of the two only appropriate choices for his own wedding (whites or blues) unless he goes with a tux or suit.
Please don't take this as an attack or personally in any way. But if you're going to be a military wife than these are things you should know and your fiance should feel obligated to uphold certain standards whether at work, overseas or at his own wedding. So do the right thing