PARIS — On the edge of a meadow in western France, Gen. Benoît Desmeulles moves between two closely-parked armored personnel carriers tucked against a cover of trees and shrubs to reach his makeshift office, a patch of grass covered by a tent and multi-spectral camouflage netting. It’s war, France is in charge, and Desmeulles for the first time is deploying the new mobile command structure of the French 1st Army Corps in its full configuration, as part of the Orion 26 exercise . “Welcome to CP1,