Regarding AR-670:
For those who are ignorant, this is the Army's official uniform regulation:
Eyeglasses or sunglasses that are trendy, or have lenses or frames with initials, designs, or other adornments are not authorized for wear. Soldiers may not wear lenses with extreme or trendy colors, which include but are not limited to, red, yellow, blue, purple, bright green, or orange. Lens colors must be traditional gray, brown, or dark green shades. Personnel will not wear lenses or frames that are so large or so small that they detract from the appearance of the uniform. Personnel will not attach chains, bands, or ribbons to eyeglasses. Eyeglass restraints are authorized only when required for safety purposes. Personnel will not hang eyeglasses or eyeglass cases on the uniform, and may not let glasses hang from eyeglass restraints down the front of the uniform.
Most normal people would not care, but I have to set the record straight. Sunglasses that are issued are always authorized in uniform, with the exception of while in formation. An example would be Ballistic M-Frames.
They have to be non-reflective, with a matte frame. This includes icons.
Otherwise, it is up to the Commander's discretion. For example, there are two recruiters in my area that wear Half Jackets that are polished black with black iridium lenses. My wife, who is in Basic Training at Ft Jackson, SC has reported that her Drill Sergeants wear the same Half Jackets. I've trained her well, if she's describing Oakleys to me, just because she knows I'd be interested.
This thread did get derailed. I originally asked about drilling GREY POLARIZED lenses, so they would still be within regulation.
If you want more styles, pay retail price like every other person would have to. If you're getting SI frames, they are for uniform use. Deal with it, or give up the discount.