Is it legal for a veteran to wear his uniform?

Excuse me, I have a question regarding the legality of veterans wearing their military uniforms in public. I understand that there are certain circumstances and events where it may be appropriate, but is there a general rule or law that governs whether or not a veteran can wear their uniform outside of official duties? I'm curious as to whether there are any restrictions or regulations that I should be aware of before donning my uniform in public. Thank you for your time and consideration.