The AH1s were much thinner that the UH1s to present a smaller target and allowed a big load of ordinance.
That being said, some US ARMY UH1s remained as gunships, e.g. Aerial Rocket Artillery[ARA] units. Not sure when they were withdrawn during Vietnam.
And yes the Pink Team was a standard technique for chopper ops. Even as a Rifle PL in the 101 in '80-'81. On an FTX I waved down a LOACH from a Pink Tm, an OH58. As I couldn't get them on the radio.
I talked to the 58's Crew, And did a quick air mission brief. Asking them to support my attack on a wooded hill at our 12. Showed them on the map. They pulled pitch and the Pink Tm lead our assault. "Guns blazing" !
The "enemy" OPFOR, a unit from a sister Bn were surprised and no doubt "we won" the "Battle". Securing the hill and capturing a number of "EPWs".
The OPFOR, from a Co. of the 503d, was commanded by a friend of mine. So it was an "enjoyable" victory. And did give me "Trash Talking Rights".
One of the other members of my Mil Ofc Assoc Chapter I had the pleasure to talk to at one of our meetings. Said he didn't like flying in the AH1. He felt it was to confining. He liked the UH1 Gunship, that was some times called a "Gunslinger". For obvious reasons.
When I was an ROTC Cadet as Benning in '76 or '77. We got to ride in some UH1 "Slicks". I remember the Pilot giving us a briefing. And he drew is hand across the fuselage and told us the lift ships were referred as "Slicks". As they didn't have any weapon racks extending from the sides packing ordinance, etc.,.
Was my first of many UH1 flights. Had to quickly get used to the doors being wide open with us strapped inside.
When the Birds were flying Contour or even NEO. We'd be flying right at tree top level. Again always with doors wide open. That was pretty much SOP. For obvious reasons.
When we came to a field, the Birds would fly low over the ground. And you were looking at trees instead of the open airspace. Then once the field was crossed they'd pop-up over the trees again. Kind of like a roller coaster ride.