Here's a page with division shoulder patches.
http://members.aol.com/custermen85/Units/Divisions.htmIt also contains some historical background on the insignia. I'm still looking, but I believe that the patch on the 25th figure is from one of the "Ghost" divisions.
edit: Nope, not one of the ghost divisions. IT's shaped like an airborne division insignia, but I can't find anything that looks like it.
edit 2:I've been through all the division, corps, school, and Major subordinate command patches, and I don't see anything like it.
http://www.uniforms-4u.com/c_d_5_Army_Patches_1090.aspx