Does anyone know how to finish this missin easily without cheat?
I failed many times in this mission         

yes with hesoyam + fullclip + kjkszpj only


Joking

Only easy way is with stealth,
-there's weak fencing at back of base(go along fence you'll find it) go through there.And head for vent(should be where vehicles parked inside)
-shoot out the lights as you make way(try not get spotted by lights or soldiers)
-Same thing for inside, stealth and kill soldiers you meet
-deactivate SAM* in control room.For rest, do what you want