Can a person be deployed when they have less than a year left when they would return?

Yes, but it is up to the Commanders discretion.

Oh yes! The will extent you until about 90 days of the unit’s redeployment.

Yes they can. You signed a contract for a minimum amount of time. Uncle Sam can extend you 'for the good the service/mission' until your deployment is done or until your transition paperwork is done. We had an NCO that deployed out with 10th Mountain. He got back and literally had 90 days left before ETS.

If you will have four months left then you will have plenty of time. You can start working on your resume now, if you haven't already, and start researching companies that you think you might want to work for. When you do get back make sure you do your ETS physical. I have talked to a lot of veterans who didn't do it and now they wish they had.

The flat out answer is yes. You command will make the decision to take you let you stay back on rear d. If it were me I would check your ets/PCS date and determine if would be worth the squeeze to take you or not.