​​​Modernized ACES Seat Sequencer:  The Modernized ACES Seat Sequencer (MASS) was qualified in 2014 to replace the DRS Sequencer.  The MASS Sequencer eliminates all obsolete components from the DRS design while adding performance via on board sensing that replaces the mechanical environmental sensor.  Expanded event recording allows better post ejection evaluation to include pressure and acceleration data from system initiation to seat impact.  The MASS Sequencer is supported in the field by the DRS Test Set with the addition of a new interface cable.  Since 2014, over 1000 units have been delivered to USAF/FMS users.​