So that makes it 7th Ohio Volunteer Infantry company L. Thank you. Being in the Army, I should be able to figure that out but I wasn't infantry.
I suspect this would have been used during the Mexican Border crisis in 1916 and 1917. Interestingly, it seems Ohio was the worst of all the National Guards mobilized for the expedition. They were so slow getting organized, they lost the transportation assets to other states that were ready.
Pennsylvania on the other hand sent a regiment to the border every day. "Using this method, the state deployed a total of 11,749 troops between June 28 and July 9." Probably why it was one of the first national Guard units (28th infantry division) to be sent to France.