If a POG, awarded with a CAB (combat action badge), were to transfer to Infantry, would the soldier be authorized to wear the CIB?

WHAT?? OF COURSE - HE EARNED IT.

You were the badges and awards you have been awarded by orders of your service. They are not interchangeable.

Wow... this made my eyes bleed. Just because you go to an infantry unit... your MOS didn't retroactively change at the time you saw combat. Now if you were an infantryman in an HR unit and just happened to engage the enemy... you got a cab by mistake and need sworn statements and SIRs to confirm that you, in fact, meet the award criteria of being an infantryman actively engaging enemy forces. If that didn't happen... even an infantryman can get a CAB if they were not directly engaging enemy forces. No returning fire, no CIB.

If the Army giveth...the Army cannot taketh away. Wear your CIB with pride. You earned it. If somebody disagrees, feel free to quote me. I have a rep to respect.

Here is an example of why I always thought it wrong that the men on the mechanics track that was always with the Bn. didn't get any badge. Yes they were manning the perimeter as we where and yes they also fought when we had night attacks or were ambushed on the road. But in no way went though what we did as 11Bravos. So in the current Army they would have gotten the CAB, which is right, yet not the same as my CIB. As an aside my Dad was a WWII Navy signalman and was part of the Armed Guard for the whole war. He was wounded at Anzio and spent 13 days in a life boat after a U boat got his Merchant ship in the Indian Ocean. He passed in 1991 but I sent the Navy Department some records 5 years ago, he didn't get the PH as it was a Merchant Capt. that put him in for it. But he was awarded a CAR and that made me very happy, wish he was a alive to see it. Goggle Navy Armed Guard and read about them.

NO! You have to be in an Infantry unit, as well as having a 11b MOS. I served 3 tours in Iraq.
First tour, I received CIB, as our Infantry unit was assigned FOB duties, as well as going outside the wire.
One of our missions caused us to come in contact with the enemy. Thus we/our unit was awarded the CIB.
The next tour, I was attached to a Combat Engineer Unit. I wore my CIB badge proudly, as I had earned it. During my rotation, with the Combat Engineer Unit, we were awarded the CAB badge. With that being said, I had the option of wearing either one, as I had been awarded them. I could not wear both of them at the same time, per Army Regulation.
My third and last rotation (before retirement), I was back with my Infantry Unit.
Because I had already received a CIB, I couldn't get a second award, as I was still fighting the same war..Iraq. Had I been in Afghanistan! Different war, different CIB (second award).

Take pride of your accomplishments as a member of a team not the trinkets they bring.

Combat Infantryman Badge CIB.
Q2: Are prior service Marines coming into the U.S. Army who earned the Combat Action Ribbon (CAR)
able to wear the US Army Combat Infantryman Badge (CIB)?

A2: No. Former Marines or Sailors who received the CAR during their service with the Marine Corps and Navy cannot "convert" their CARs into CIBs. The CAR is not equivalent to the CIB. It is similar to the Combat Action Badge (CAB). The CAR, like the CAB, is awarded to any Marines/Sailors who have actively participated in ground or surface combat. Personnel assigned to areas subjected to sustained mortar, missile, and artillery attacks actively participate in retaliatory or offensive actions are eligible for the CAR. The CIB, unlike the CAR, is only authorized to be awarded to Infantry and Special Forces Soldiers who are engaged in active ground combat, to close with and destroy the enemy with direct fires, while assigned to an Army Infantry or Special Forces unit.
https://www.hrc.army.mil/content/Combat%20Infantryman%20Badge%20CIB

Combat Infantryman Badge CIB.
Q2: Are prior service Marines coming into the U.S. Army who earned the Combat Action Ribbon (CAR) able to wear the US Army Combat Infantryman Badge (CIB)?

A2: No. Former Marines or Sailors who received the CAR during their service with the Marine Corps and Navy cannot "convert" their CARs into CIBs. The CAR is not equivalent to the CIB. It is similar to the Combat Action Badge (CAB). The CAR, like the CAB, is awarded to any Marines/Sailors who have actively participated in ground or surface combat. Personnel assigned to areas subjected to sustained mortar, missile, and artillery attacks actively participate in retaliatory or offensive actions are eligible for the CAR. The CIB, unlike the CAR, is only authorized to be awarded to Infantry and Special Forces Soldiers who are engaged in active ground combat, to close with and destroy the enemy with direct fires, while assigned to an Army Infantry or Special Forces unit.
https://www.hrc.army.mil/content/Combat%20Infantryman%20Badge%20CIB

Actually no, because if the person isn't infantry then they don't get the Combat Infantry Badge. The person will still have the Combat Action Badge though.