As a new section NCO, what would be the best way to deal with squad leaders who skipped the chain of command (myself)?

I see you are a Corporal, and based on comments you had not updated your rank prior to posting so I will go from there.

You are a Corporal and yes that means you're an NCO. Now while I don't know where you are at in your section, whether you're a Team Leader or a Squad Leader, or in charge of a few Privates and Specialists in your section, etc; how you handle this is going to alter how your troops perceive you.

You said you're a new section NCO, how new? Are your guys just used to going through the other NCO's in the chain? If that's the case you'll have to have a sit down and explain the new chain, but not before you talk with your SGT or SSG as applicable about how that chain functions. No need for you to be putting out false information. I can tell you smart PFC's and SPC's will pick up on that false info quick whether you intended for it to be false or not.

So get with your NCO and work out a plan for who exactly are your Soldiers and how you fit into that structure as a Corporal, then get to know your guys, then start building your leaders book with all of the information you'll need about developing your Soldiers (again, NCO chain for good examples and advice), then have that sit down about the new structure as it applies to you and to them.

If there's issues after that, again, get with your NCO chain about how to conduct your first counseling. As a Corporal you're learning how to become an NCO, hell even as a SGT you're learning all the time, and probably screwing things up along the way. So walk into this knowing you don't know what you're doing all the time and just try to be level headed and learn as much as you're trying to lead.

As a Corporal are you owed respect by virtue of your rank? The quick answer is yes. The real question is, what are you doing to earn that respect? If you come down like a hammer over this probable miscommunication or misunderstanding about where you and they fall in the chain then they might "respect" the rank, but they certainly won't respect you.

Learning how to effectively utilize your chain of command is fundamental in properly it for its designed purpose. The provides a certain decorum in addressing issues at the appropriate level and fosters communication with a leader who should be addressing the issue at hand.

As a Corporal, you ARE an NCO. Simply instruct your co-worker subordinates that YOU are the start of the chain of command. After that, you address the NCO who allowed them to go around you, but there may be a circumstance where it "could" be proper depending on your unit's SOP and the subject matter, especially if it's of a sensitive or highly personal nature.