We've got I/3/4 on the marine AAV in the shot.
I know that's 3rd Battalion/4th Marine Regiment (1st MARDIV)
What's "I" )that's capital letter i)
I know that's 3rd Battalion/4th Marine Regiment (1st MARDIV) What's "I" )that's capital letter i) "I" stands for "India" Company, 3d Battalion, 4th Marines