When people opt to DOR.....Drop On Request, and it is done prior to the first day of classes in their sophomore year, they will check in with their HRA and complete paperwork. Part of that paperwork will consist of their being informed that they are not required to reimburse previous tuition payments and that they have no service obligation (active or reserve) to the Department of Defense.
They will be required to turn in their uniforms, and NROTC text books, and any other supplies that were issued to them. Should they have any questions, THAT is the time to ensure those questions are answered.
To be frank, for anyone reading this, if you are truly concerned over potential obligations for an enlistment contract, those concerns should be addressed BEFORE you ever sign the contract. This seems obvious to me, yet I used to get questions all the time as to what was in the contract.
If anyone here needs legal advice as to what they have committed themselves to (or what your DS or DD has committed to), then it would be best to retain professional legal advice.