A key part might be 'red air' (always of interest to fighter pilots) as stated by ORAC, but ASDOT also encompasses:
"The scope of the ASDOT programme currently covers provision of live
flying assets to meet the following training requirements:
-Air to Air Combat;
-Air to Surface Combat;
-Joint Terminal Attack Controller (JTAC)/Forward Air Controller
(Airborne) (FAC(A));
-Electronic Warfare;
-Air Traffic Control (ATC);
-Ground Based Air Defence (GBAD);
-Aerospace Battle Management (ABM);
-Live Gunnery."
Regards
Batco