I solved the problem about decals.
In fact,one man from another forum,was kind enough to give me "two" sets of that.
One set is from Italeri's boxes,and the other set is Hasegawa,but it is as seen in the pictures desecrated.
Probably,almost certainly will use that in Italeri's boxes,because the paint scheme for these markings gray camouflage,as the majority of A-10 aircraft.
Now there's only to find resin or something PE set for cockpit for the A-10A, since the one in the box quite poor.