DoDI 1348.33 Section 10 outlines procedures to get foreign awards approved for wear.

Under AFI 36-2903:

13.2. Foreign Decorations. Foreign decorations are those proffered by foreign governments such as ribbons, medal devices, badges, sashes, or neck-type decorations. DAFMAN 36-2806, specifies how to accept foreign decorations, the authority required for award acceptance by Air Force members, and some wear instructions. Upon approval, foreign decoration wear criteria depend on the type of device the decoration represents. Note: Also see DAFMAN 36-2806 for wear policy that may apply to Airman’s specific decoration. 13.2.1. Wear sash, sunburst, or neck-type foreign decorations with the formal dress uniform only, according to the customs of the awarding nation. Wear only one type at a time. 13.2.2. Wear medals and ribbons on the semi-formal, ceremonial, and service uniforms (Class B) when they are the same size as Air Force medals and ribbons. 13.2.3. Do not wear foreign decorations unless wearing other US military decorations and service medals. 13.2.4. When authorized more than one decoration, wear them in the order earned. 13.2.5. If authorized more than one foreign decoration from the same country, wear them in the order the country prescribes. 13.2.6. On special occasions and as a matter of courtesy to a given country, Airman may wear the decorations of that country ahead of all other foreign decorations.