[Liberty Valance]

Is this the old USAF Dress uniform?

[Yo-Yo]

That is a Mess Dress, a military tuxedo. Only worn at very formal occasions where civilians would be wearing tuxedoes. Judging by the CMSgt stripes, it is also a pre 1990's version. After I left, MSgt, SMSgt, and CMSgt stripes were slightly changed, with one less rocker stripe below the star, and one extra chevron stripe above. Here is a more current version, and the CMSgt stripes here also have the First Sargent star.

[Paladin2b]

That's the old Mess Dress uniform, not the Service Dress uniform sought to be changed.

That being said, I'd deep-six the Mess Dress as well. The most embarassing moment in my father's duty in the USAF was when he (a major) was mistaken for a waiter at a swank dinner party in a Chicago club.

[ops33]

That's the Mess Dress uniform, worn for formal occasions indoors. It's the AF's equivalent of a tuxedo. BTW, the medals shown in that phot are incorrect. They are placed way too low on the uniform.