It is military.
it is a Lear.
It is not a C21.
Bob Hoover and Clay Lacy weren't involved.
It actually is a Learjet 35A/S, the Finnish AF version with a bit more in-flight entertainment gadgets than on your average C21 or biz jet. Versatility is enhanced with underwing hardpoints. To my knowledge these were the first Learjet 35's delivered for military use in 1982. First C21's were delivered in 1984 I believe. BTW, in 1982 these replaced Il-28's as target tugs and maritime recce duties. And these are still in use, though rather extensively updated in recent years.
The picture was taken very recently while the aircraft on the picture was on a mission. Rotate the picture 90 degrees CCW and you'll find it being in a rather level attitude.
underneath is a more informative picture of a 35A/S.
So, there were many who identified, but as Lear 35 was mentioned by cavuman1, I'll offer the control to your corner.
