The first 2 F-10SEP fighters have been delivered to the DDSAF's operational evaluation service ahead of deliveries to combat squadrons later in the year. The SEP is considered the "2.5 generation" of the F-10 and includes an improved wing to enhance agility and fuel economy, uprated engines, improved IR stealth and enhancements to the avionics.
Only 20 SEP are on order for the DDS, though Haylei have also got 50 of the modified SEPH on order. It is expected the DDS will increase their order once Haylei receive their aircraft. Rebuilds of the oldest F-10S to SEP standard may be a possibility though the DDSAF have yet to announce any plans.