Starting About 9:25 picked up a group of three transitioning through the area, sounds like they have a block from 16,000 up to 21,000. Aircraft are DEECEE 51, RAVEN 1 (MD ANG), AND SPORT 1 (MD ANG). First contacted Cleveland Center on 239.30 (ZOB - Morgantown) and switched to 257.975 (ZOB - Belmont). Is DEECEE 51 a refueller? Dave