A combat group is a military UNIT composed of personnel from different branches of the armed forces. The term 'combat group' can refer to a UNIT of any size, ranging from a small squad to a large battalion. In this crossword, the solutions for the term 'combat group' are UNIT (4 letters) and MARINES (7 letters). The UNIT solution refers to any type of military UNIT, while the MARINES solution specifically refers to the United States Marine Corps.