[quote=@The Spectre]
		I know that this is jump-in but I was wondering if you could tell me the the differences between Infantry Platoon leader or Company Operations Sergeant? I am interested in being either role.
[/quote]

I'm Navy and work with Marines so I only know Marine stuff so it may be slightly wrong.

Marine Infantry structure is as follows:
4 men make up a Fireteam.
3 Fireteams make up a Squad.
3 Squads make up a Platoon
3 Platoons make up a Company.

So a Platoon Leader is the Officer in charge of a single Platoon, normally they get orders from Company Command and desseminate it to their Squad leaders who desseminate it to Fireteam leaders that lead the actual men on the assault.

Company Operations Sergeant is the NCO in charge of the Company level stuff, so lots of Paperwork and likely advising the Company Commander on tactics and strategy in combat situations.

One is an Officer in charge of less people, one is an NCO "in charge" of more people.