The headline for this forum
Military Aviation:A forum for the professionals who fly military hardware. Also for the backroom boys and girls who support the flying and maintain the equipment, and without whom nothing would ever leave the ground. All armies, navies and air forces of the world equally welcome here.
I don't see any requirement that posts can only deal with "contemporary military aviation"
In any case military experience and lessons are often timeless. The linebacker II thread is a good example.