oh man that Is an annoying mission! have you tried going to mission info then select "tactics"? Ill give tips anyway
ok, you want to get Anti-aircraft and Md tanks to the center once you've established a Defense with AA and MD tanks build Missiles to shoot down waylon (I shot him down 5 times) Then Rockets and Artillery and anti-tanks to supress the ground units, then build bombers and fighters (if you cant afford a Bomber, build a war tank) once your in control of the middle heres building priorities:
1.Bombers/fighters
2.War tanks
3.Md Tanks
4.Anti-tank
5.Save the money for next turn
(1 being the most suggestable) REMEMBER hide bombers and fighters behind war tanks, anti tanks, AA guns, things that can stand up to enemy bombers and Dusters then once all anti-air and missiles are gone move in fighters and bombers to take care of ground and air! but hide air units until then, cluster them behind the ground force then use the ground to punch a hole and the Air units will finish the fight!
or try the suggested tactic (mine's way more in-deapth) hope my tips help you get Waylon, PM me if you ever want more of my tips