U.S. Marines and troops from the 30th Infantry Regiment, 12th Brigade, Japan Ground Self-Defense Force are briefed on upcoming integrated defensive tactics training during exercise Forest Light 21 in Niigata Prefecture, Japan, Dec. 10. - U.S. Marines and troops from the 30th Infantry Regiment, 12th Brigade, Japan Ground Self-Defense Force are briefed on upcoming integrated defensive tactics training during exercise Forest Light 21 in Niigata Prefecture, Japan, Dec. 10.