Sgt. Ray A. Finlay, a KC-130J crew master with Marine Aerial Refueler Transport Squadron 252, stands in front of one of the aircraft he works with Friday. KC-130J crew masters are responsible to help support whatever mission the aircraft is on at the time of the fight. They help with aerial refueling by observing and operating the aerial refueling panel, help during drop missions and more. - Sgt. Ray A. Finlay, a KC-130J crew master with Marine Aerial Refueler Transport Squadron 252, stands in front of one of the aircraft he works with Friday. KC-130J crew masters are responsible to help support whatever mission the aircraft is on at the time of the fight. They help with aerial refueling by observing and operating the aerial refueling panel, help during drop missions and more.