I hate to be nick picky but Marines are not soldiers. Carry on.
Unless you wish to cause mild offense, refer to them as Marines (usually capitalized). Members of the U.S. Army and National Guard are soldiers. Members of the Air Force are airmen. Members of the Navy are sailors.
“The USA Soldier bales out the Frogs once AGAIN. Good job Marines.”
I hate to be nick picky but Marines are not soldiers. Carry on.