JOINT BASE ELMENDORF-RICHARDSON, Alaska (AP) — U.S. Army leaders say they are poised to revamp forces in Alaska to better prepare for future cold-weather conflicts. They are expected to replace the larger, heavily equipped Stryker Brigade in Alaska with a more mobile, infantry unit better suited for the frigid fight. Army Secretary Christine Wormuth says she expects to make a final decision soon about the Alaska troop change. The U.S. has long viewed the Arctic as a growing area of competition with Russia and China. Those concerns come as climate change brings warmer temperatures and opens the sea lanes for longer periods of time.