Will the army still send me on a deployment knowing that my school date falls in the middle of the rotation?

How about you you STFU, deploy, pull your damn weight and stop asking stupid questions looking for a way out.

What school? Most likely yup. You deploying. Thats part of the game. NCOES they probably will just put in a deferment for you. A civilian school? Oh yeah thats a wrap, they not sending you back for a non military school. Just from my expierence.

It costs the unit nothing to return you to your duty station.
Unless your assigned to the ONLY Army unit in history that is so over strength in every MOS, Id bet you can be an asset to the commander in country.
I would hope that Professionalism, selfless service and other expected traits would lead you to WANT to deploy with your unit for as long as possible prior to going to school>
Three phases of deployment going in and getting established, maintaining transition to new unit.. The set up with all the unknowns, the learning cure is the most resource intensive... Unless your really bad at your job, unreliable, and basically a worthless SM, your help is needed in country.

Consider what you need in time back home before school, go to the Cofc with a plan, how you can go and help, but get back in time for school.

In 2003 I was scheduled to attend the Resident phase of Sergeants Major Course, Guess What? NOOOOOOO you're presents is required in Kuwait/ Iraq. I was lucky, later on that year, after things settled down (last of November) they made a special course because so many of us were deployed. Needs of the Army out weigh the needs of the individual. But this doesn't mean you don't talk with your leadership and see what can be done if anything.
While deployed I was also able to get two of my newly promoted SGTs to NCOES but all conditions of the deployment had to me met.

Assuming you are talking about NCOES....

Here is your answer, from MILPER 16-089

"C. ONCE A SOLDIER IS SELECTED FOR ATTENDANCE TO ALC, THEY WILL NOT BE REMOVED FROM CLASS UNLESS THE SOLDIER NO LONGER MEETS ELIGIBILITY REQUIREMENTS OR A DEFERMENT IS APPROVED BY HRC. SOLDIERS WILL NOT BE REMOVED FROM CLASS BASED SOLELY ON OTHER SOLDIERS SUBSEQUENTLY OBTAINING MORE PROMOTION POINTS.

D. EVERY EFFORT WILL BE MADE TO SCHEDULE TRAINING FOR SOLDIERS WHO HAVE BEEN IDENTIFIED FOR DEPLOYMENT, SHORT TOUR, OR UNIT ROTATION, PRIOR TO THE EVENT, IF THE SOLDIER WOULD HAVE BEEN SCHEDULED DURING DEPLOYMENT, SHORT TOUR OR UNIT ROTATION.
...
6. NCOES DEFERMENT POLICY:

A. ALL DEFERMENT REQUESTS MUST BE SIGNED BY THE FIRST GENERAL OFFICER (OR EQUIVALENT) IN THE SOLDIER’S CHAIN OF COMMAND. DEFERMENT REQUESTS MUST PROVIDE AN ALTERNATIVE DATE(S) WHEN THE SOLDIER WILL BE AVAILABLE FOR TRAINING.

B. OPERATIONAL DEFERMENTS ARE APPLICABLE TO UNIT DEPLOYMENTS, UNIT ROTATIONS, OR A MAJOR TRAINING EXERCISE IN SUPPORT OF A UNIT DEPLOYMENT OR ROTATION. THE FIRST OPERATIONAL DEFERMENT REQUEST FOR NCOES ATTENDANCE MUST BE SIGNED BY THE FIRST GENERAL OFFICER (OR EQUIVALENT) IN THE SOLDIER’S CHAIN OF COMMAND AND FORWARDED TO HRC FOR APPROVAL. THE SECOND OPERATIONAL DEFERMENT REQUEST FOR THE SAME NCO AND FOR THE SAME NCOES COURSE MUST BE SIGNED BY THE NEXT, HIGHER-LEVEL GENERAL OFFICER (OR EQUIVALENT) IN THE SOLDIER’S CHAIN OF COMMAND AND FORWARDED TO HRC FOR APPROVAL."

depending on if you are Mission critical and your expertise is need... But the Commander can Pull You Off of Orders with little to No Justification...

SGT (Join to see) it really depends on the unit. I have seen people not go on deployment, I have seen some go on deployment and then leave, I have seen them deploy, go to school and come back to theater, and I have seen the unit force them to defer the class and reschedule it for after redeployment.

a lot of recruiters fail to tell people that the education you earn is a privilege while active duty. I had several Marines that had to drop out or postpone schools because of operations.

Well you should be getting answers from your unit. That being said, is this a personal school like college or is this a military education school for your MOS. Depending on the school depends on my answer.

If it's a civilian school, you can expect to be deployed. Military doesn't care about your prior commitments, because your number 1 priority is the military.

If it's a military school, you shouldn't be deployed, because you receive orders to go to military school. Military orders supersede everything else.

Chances are, you'll be transferred to another non-deploying unit until your school orders take effect.

But you should be getting these answers from your chain of command. Because they're the ones who will be giving you orders and signing you up or holding you back from the deployment.

What's the school? Chances are they will cancel it. It cost a lot of money to send someone back and forth. If the school is BLC they used to run courses at Camp Buerhing in Kuwait for folks in theater. Not sure if that's still the case. When I was in AFG they let our Ops NCO go home a few weeks early to go to ANCOC but I think that was an exception to the rule. I was actually scheduled for BNCOC (or ALC or whatever it is now) in Jan 2012 and my new unit was leaving in March/April 2012. I wouldn't have missed any of the deployment, just the train up, but it was cancelled anyhow. For some reason they rescheduled for a date that was during our deployment so it had to be cancelled yet again. The next date I could get was almost a year later and I would've have missed the cutoff for the SFC board. The whole situation left such a bad taste in my mouth that I decided to ETS when my contract was up. Of course I'm back as an O now but that's a whole other story.