The Archives doesn't have a comprehensive list of MHC alums who have served in the military. You might try contacting the Alumnae Association to see if this is something that they might have available. Archives does have an inventory of "MHC: Wars and Warfare" resources that highlights Archives & Special Collections' materials and alumnae collections about military activity and other war service work. See https:.//www.mtholyoke.edu/archives/collections/war_warfare