Operation Sierra-75 — Thomas S. Gressman

Torn from the universe by a cosmic vortex, Earth remains trapped in the Maelstrom, swirling toward ultimate destruction. Now, a company of Union Marines and medics, sent to find the survivors of a crash landing on an unexplored planet, find themselves trapped in a hellish world, hunted by an unknown enemy. When weapons and equipment begin to vanish, and strange, murderous creatures haunt the Marines' every move, a simple rescue mission becomes a desperate death march....