Thanks for the extra information guys! This is pretty fun so far!
I went to the research center/library on Quantico today, could only stay an hour and a half so I could get off base before all the traffic kicked up. Here's what I found though, some of it not entirely useful for my build but all of it I found interesting.
From the CSI Battlebook: Operation Chromite (Inchon) I found a detailed schedule of the Red Beach Landing page 65:
"RED Beach
(5 Regimental Combat Team (-))
D-Day
[...]
1724 hours: Signal given to land. Eight (8) LCVPs move to RED Beach troops
consist of 2 platoons from Company A, 1/5, and all of Company E, 2/5 Marines.
1733 hours: 3 of 4 leading LCVPs strike seawall. Assault of
Southern RED Beach begins. On Northern RED Beach, the remaining force reach
shore -1 LCVP breaks down. There is heavy causualties and fighting before
breaking out from RED. First Medal of Honor won here by Lt. Baldomers Lopez.
[...]"
There was one other book I looked at, I can't for the life of me remember and I can't believe I forgot to write the title down. I believe it was something like Marine Corps Operations in the Korean War: Volume II or something to that degree. Anyways, it gave an entire list of the joint task force that was at Inchon, including the transport group for the advanced attack group. This was on page 314.
George Clymer
Cavalier
Pickaway
Henrico
Noble 5
APA
Union
Alshair
Achernar
Oglethorpe
Seminole
Thuban
Whiteride
Washburn 8
AKA
Earlier in the book (page 98) it said, "Aboard Henrico and Cavalier in Inchon narrows on 15 September were the 1st and 2d battalions, 5th Marines." 4 pages later it said the assault troops of the 5th Marines boarded LCVPs from the Henrico and Cavalier.
So in summary of today's research, the most valuable information I learned directly regarding to my dio, is that the LCVP that Lt. Lopez was on was from either the USS Henrico APA-45 or the USS Cavalier APA-37.