While in uniform,may members wear items of religious apparel which are visible?
See CAPM 39-1 Table 1-2 & 2-5
Wear of Religious Apparel
Members may wear certain visible items of religious apparel while in uniform. Religious apparel is defined as articles of clothing or dress that are part of the doctrine or traditional observance of the religious faith practiced by the member. Hair and grooming practices are not included in the meaning of religious apparel. Jewelry of a religious nature must conform to standards set forth in this regulation for wear of non-religious jewelry. Religious head coverings are authorized only when military headgear is not authorized. Head coverings must be plain dark blue or black without adornment. Also, they may be worn underneath military headgear if they do not interfere with the proper fit or appearance of the headgear. For example, Jewish yarmulkes meet this requirement if they do not exceed 6 inches in diameter.
Table 2-5. Clothing/Accessory Standards
Religious Head Coverings
Indoors: Plain, dark blue, or black without ornamentation. Outdoors: May be worn underneath military headgear if does not interfere with proper fit or appearance of the headgear. For example, Jewish yarmulkes meet this requirement if they do not exceed 6 inches in diameter.