Normally, in developed countries extension nahi di jati, q k wahan per idary strong hoty hain, aur kisi k anay janay say adary ki policy and workflow mein koi asar nahi parta.
But Pakistan mein jaisay jamhooriat looli langri hai, waisy hi adary b hain, so jaisy hi head of department change hota hai, us ki policies and workflow change ho jata hai.
So if u want k jo kaam Gen Raheel is waqt ker raha hai, woh successfully complete kary to He should be given extension for 2 years. otherwise let him go and give the new general chance to introduce his policies.
waisy b Army chief k liye 3 years ka tenure boht kam hota hai. aik paidaar solution k liye zaroori hai k tenure thora ziada ho army chief ka, ta k wo jo targets lay ker aya hai woh achieve kary aur jaye, aur extension ki zaroorat hi na pary. But yahan per tenure barhany ki bijaye her army chief ko extension deny ka socha jata hai, which is not proper solution.