If I'm hard slotted for BLC, can my leadership cancel it so they can take me to JRTC?

SSG Manuel makes a good few points. However, she also is not looking at this from the selfish point of view on the unit. I have seen units try to pull Soldiers from NCOES due to "Mission Requirements" when all they really needed was a body to fill a slot. I have served as a Schools NCO and scheduled many schools and such and have seen the requests for such things come through. The good news for NCOES is it considerably more difficult now to pull someone without proper justification in the form of a 4187 and an accompanying memorandum from a unit commander to whoever owns that schoolhouse. Then, the unit must also specify a timeframe when they intend to send the Soldier. This gives the higher echelon as well as the Soldier something to use to hold the unit accountable to the welfare of a Soldier and their career. Another point to consider is whether you are close to losing your stripes because you haven't attended BLC? If so, the unit can't not send you as it's mandatory in accordance with the parameters of the STEP program. Speak to your leaders, determine why they would try to cancel your class date. If you feel they aren't being fair exercise your NCO Support Chain and Chain of Command and give them the opportunity to fix it. However, this is YOUR career. Don't sit on your laurels and let others dictate when you do certain things. Be proactive while still being tactful.