[header] How to know military uniform laws [title] Obtain your uniform only from your branch of the armed services. [step] It is illegal to wear a uniform or any uniform part that is not issued by the branch of the armed forces in which you serve. Under most circumstances, members of the armed services can be punished under the uniform code of military justice (ucmj) for wearing anything that is unauthorized. 
Even wearing awards or insignia that you have not earned is prohibited. For example, a member of the navy may not wear the uniform of the army.