The 3rd Marine Division Flag is used by the 3rd Marine Division. The 3rd Marine Division Flag has a black background, a red shield, a black and yellow triangle, and the words, 3rd Marine Division.
The 6th Marine Division Flag is used by the 6th Marine Division. The 6th Marine Division Flag's black background has a red circle with a large six in it and a sword.
The 1st Cavalry Division (Black) Flag is used by the 1st Cavalry Division. The 1st Cavalry Division (Black) Flag has a black background with a yellow shield. The shield has a black horse on it.