Dugwayâs Chemical Test Division successfully tests JCAD system on Stryker. Caged in a menacing looking metal grid with intricate sensory equipment attached to all sides the Armyâs M113 NBC RV Stryker vehicle sits on a dusty road at Dugway Proving Groundâs target S grid being readied by its crew for testing....
The following conditions are when secondary curvatures of the spine  develop:   Cervical-when the baby starts to hold its head up   Lumbar-when the baby starts to â¦ walk. 4 people found this useful.
âAs soon as you start to raise your knees, that secondary curvature of your spine [in your lower back] starts to go away,â says Winter. The rounding in your lower back mimics the natural curvature of your spine that occurs when youâre sleeping on your side, in the fetal position.