The only way that I know of to compile a roster would be to contact
the United States National Archives and Records Administration
(NARA). You'll want to obtain what are called "Morning Reports" and
"After Action Reports." I'm assuming that the names of Medics would
also be included in these reports. The Morning Reports will list the
names of those sick, transferred, wounded, etc. The After Action
Reports include information about combat movements and actions and may
include the names of some of those involved. I've never, personally
ordered these documents but I do have some from my dad's unit - 290 F
and L. I've heard that there is a specific method for ordering these
documents from NARA, I'm sure they could give you the specifics. You
might also write to the 75th Division Veterans' Association and submit
your inquiry to them by asking that it be published in their monthly
newsletter, "The Bulgebuster." There may be a Veteran member of the
Association who remembers Michael Gregg and could supply more
information to you. I would also suggest that you purchase an
Association Membership Roster from them (I think they are $10.00)
because it will list all current members from the 289th. You might
include a photo of him from the period, if you have one. The address
is: 75th Division Veterans' Association, Attn: James Warmouth,
Secretary. 6545 W. 11th St., Indianapolis, Indiana, 46214. Also, you
might b interested in attending the next Association reunion in
Indianapolis, IN. You can get the registration forms here >
http://hldnoqtr.tripod.com/75thnews.htm#3 Hope this helps.