 It added even more fuel capacity, more improvements to control surfaces, and possibly an active electronically scanned array (AESA) radar from the canceled A-12 attack aircraft.The last "Tomcat" variant was the "ASF-14" (Advanced Strike Fighter-14), Grumman's replacement for the NATF concept.By all accounts, it would not be even remotely related to the previous Tomcats save in appearance, incorporating the new technology and design know-how from the Advanced Tactical Fighter (ATF) and Advanced Tactical Aircraft (ATA) programs.