Hong Kong CNN  —  The Chinese military officials in brown uniforms fan out around rows of young trees, shoveling soil into freshly dug pits. The camera pans to the most senior leaders one by one, in order of rank. But one prominent face is conspicuously absent. The news segment , aired Wednesday night on China’s state broadcaster, features a tree-planting event in the outskirts of the capital Beijing – an annual springtime tradition for the country’s military leadership spanning more than four