Social or official functions of a general nature occurring in the evening. 22. For private formal dinners and other Special evening private formal social functions dress uniform. occurring in the evening. 23. For ordinary evening wear when desired. -------------------------------------------------------------------- Blue mess dress 24. For private formal dinners and other uniform. In the private formal social functions Tropics and at occurring in the evening. other places in 25. For ordinary evening wear when desired. hot weather, the white mess dress uniform may be worn. -------------------------------------------------------------------- _In the Tropics._ 26. Until sundown when prescribed. 27. For ordinary wear after retreat. 28. For official occasions, under arms, White uniform. when prescribed. _In the United States in warm weather._ 29. For ordinary wear after retreat. 30. For social use after retreat. 31. When off the post, or reservation. -------------------------------------------------------------------- Throughout the military and naval services of the United States when officers of the Army, Navy and Marine Corps appear together in uniform upon occasions of ceremony the following are the uniforms designated for each of the three services: