5th Marines was an element of 1st Marine Division (one of the division's four regiments). Marine regiments are called "Marines" in the same fashion army regiments are referred to by arm of service (1st Artillery, 1st Cavalry, 1st Infantry, etc.). To avoid confusion, marine brigades and marine divisions are always referred to as such.
For those who respond, "So what! They know what I'm talking about!", consider this. Not long ago, you could request info on, say, 6th Marines. At that time, a couple sources I still use would have sent you packets on BOTH the 6th Marine Regiment AND 6th Marine Division. Such ambiguous requests are now very often returned unanswered. No information. No explanation. If you don't know what you want, "they" aren't going to figure it out for you (mainly because "they" don't know either).
The flag raisings (there were two) took place on 23 February. All who took part were members of 2d Platoon, Company E, 28th Marines.
First Lieutenant Byron Earl Fisher was a platoon leader of Company H, 27th Marines. I can furnish a list of names of all who were members of his platoon on the date of his death - including Platoon Sergeant Theron Haywood - for a fee . . . .
or, you can contact the division's veterans association at the address in the message below. Perhaps they can put you in touch with a former platoon member who can help.