Is it appropiate for a prior service member to correct service members on AR 670-1 violations?

Right-o. When a Private corrects a Colonel, let it be done in a respectful, tactful manner. Method A: "(Render salute) Good morning, sir. I couldn't help but notice that your collar is turned up in the back." Not B: "Hey. Fix your collar, Colonel." If you receive disrespect after going with option A, grab a minute with the post commander, under the open-door policy. Please return to share your experience.

You can bet your pay.

Should a taxi cab driver give driving advice to anyone about driving?

NO, on the spot corrections are good for all- to include my favorite O7

Well being your prior service and no longer in the service, I'm pretty sure you as a civilian can say what you please. Even if it were to state in AR670-1 that a PSM can not correct a SM.

Personally I correct people on adaily basis. I’m not even near a navy base anymore and I still correct them. I’m a dual branch combat war/disabled/retired veteran. I don’t care what they say after I correct them but I’m polite and courteous about it. If they don’t correct it immediately I ask them them where they are stationed and then contact the local recruiter and have them deal with it. When I contact the recruiters I also provide a photo of the person in question. Just like when I contact the police about a law breaker. Photos speaker louder than words most of the time.

I've been instructed by NCOs to always, respectfully, make such corrections. Therefore, I have called a CSM's attention to the fact that he had lost his flag. He thanked me.

Thing about regulations is they are always changing. Go for it if you want to and there's nothing wrong with it if you're tactful, but you could also be wrong.

You should try, it's sad that they are corrected as much as they need to be- BUt make damn sure YOU are right in what you are correcting.

If your patches, name tapes, boot places etc are ate up then yes. Nobody likes walking around ate up. When it comes to AR 670-1 infractions, no. stay in your lane, if you are no longer in the service. An active service member will spot the infraction and correct it. The reg has changed quite a few times in the last 5 years and so have the uniforms.