In this photo released by the U.S. Marine Corps, a small detail of U.S. Marines lies in the snow with rifles ready at a curve in a road near Yudan in the Chosin Reservoir area northwest of the port of Hungnam, Korea, Nov. 29, 1950.  They are shown at their snowy post as the 1st and 7th Marine regiments were retiring under heavy pressure by three enemy divisions.  One soldier, right, has a bayonet fixed on his weapon.  