Can Marines wear the Navy rifle and pistol ribbons with the appropriate qual markers instead of the metal qual ribbons?

Order of precedence is jacked up also.

PO2 Keith Van Auken - Not if he was previously in the Corps.

There are RPs who started in the USMC and the switch to the RP rate, so they could have USMC Good Conduct as well as Navy Good Conduct. The marksmanship ribbons would be in lieu of USMC badges.

With all the Admin guys/gals on this platform someone should surely be able to answer this one correctly. I know if he/her were prior Navy Service then definitely yes but order seem to be off.

PO2 Michael Henry - Proper protocol is if in doubt, salute. You then should return the salute and if possible stop and respectfully correct him. He should respectfully accept the correction.

Sgt Dan Catlin - The best option would be to literally take a second or two and make a complete observation before embarrassing yourself and your branch. All branches of the US military use the same officer rank insignia, shouldn't be mistaken for something clearly not. Also, the Navy has an all khaki uniform for officers and chiefs.
Odds favor it's an officer. The E-1 through E-6 has a khaki shirt and black pants. Painfully obvious.

Well, aren't we full of ourselves. Embarrass myself and my branch? In some situations there just isn't much time. Passing suddenly, the Navy guy in a vehicle, etc. I've also been in a vehicle when Marines wearing jump wings on a Marine Air Base were mistakenly saluted, presumably because the enlisted thought he was saluting a pilot. Also many Marines seldom see Navy personnel wearing their own uniforms, so the instinct is to salute. Protocol is protocol, and courtesy is courtesy, and count yourself lucky you never had the bad judgement to call out a Marine in person with that attitude.

Yes, the first time I saw a Navy Corpsman with a Marine Summer Service dress uniform on, I saluted. I realized my mistake, but held my salute until he returned it. I have a lot of respect for our Corpsmen, and would never diss one like that. He saw that I had realized, smiled as he returned the salute, and we both went our ways, neither having disrespected the other person or their branch of service.

Unfamiliarity with the uniform and insignia of another branch can also lead to mistakes. Again, would you rather we disrespected your service, possibly passing up officers just because it might be you? If unsure, salute! Easier to correct that mistake, possibly over a beer than to pass an officer.

Some bases overseas (i.e. Osan AB R.O.K.) require all officers in BDU's at the time to wear their brite rank insignia if they wanted to ensure proper salutes at the proper time. Hence the reason this U.S.A.F. Sergeant failed to recognize the black metal insignia of some visiting U.S.M.C. chopper pilots. Ass chewing ensued, I took it, apologized and informed said officer of the Osan AB requlation. Blue beret and odd patches on my uniform had the gentleman checking me hard and then went about his business.
Be courteous, people. We are all on the same side

anderson, that is incorrect about a Marine who joined the Amey wearing a combat patch from his time in the Marine Corps, according to the AR the combat patch is allowed for Army members who were attached to Marine units during combat operations. i have a few buddies who were wearing one from time in the Marine Corps and had to take them off as they aren’t authorized

Another example is the 'French Fortiguer'(sp) rope, which only members of the 82nd Abn Div and Special Forces are allowed to wear. and only while assigned to the unit. The SF chooses not to wear it, however.
Also any unit citations. You can wear it while in that unit. or as in my case, you can wear that unit citation if you were in the unit when it was awarded to the unit along with any unit citation in the unit you are assigned to.
I was awarded the So Vietnam version of our 'Silver Star' but don't have it on my uniform, as that country is no longer an official country. So I have it put away in my 'goodie' box of stuff.

SPC Keller you are incorrect. I spent 16 years in the Navy before commissioning in the Army. I was allowed to wear my Naval Aircrew Wings. I have soldiers in my unit who are prior Navy submariners and SWOs as well as a former Marine Aviator who all wear their Navy badges with pride. I've been in the Army 18 yrs and have never been called down for wearing my Navy wings. It's in the Army Uniform regs. You can wear badges from other services. However...No on the Navy Marksmanship badges. Not sure about wearing Marine patches on Army uniform if prior Marine combat duty but its perfectly ok to wear a Marine combat patch if you were a Soldier assigned to a Marine unit in a combat zone.

Had a US Army SSG who was former Navy and wore his hard hat diving medal on his dress uniform. Definitely got a lot of second looks. (This was in 1975 time frame)