Silent Invaders:Combat gliders were called by some as Death Crates, Purple Heart Boxes, Flying Coffins and Tow Targets . They were not pretty and had no graceful lines. Viewed from the front, they had a pug nose and a sloping Neanderthal forehead. Their wings looked like the heavily starched ears of a jackrabbit placed at right angles on a canvas covered frame. Twice the length of the body, these wings were eighty four feet in length, 70 per cent as long as the