Soldiers stationed in Alaska, who are used to below-freezing temperatures, are just now finishing a mission that not only provided them invaluable desert training for their coming mission in Iraq but also snared thousands of undocumented immigrants and thousands of pounds of marijuana. More than 400 soldiers in the U.S. Army's 4th Squadron, 14th Cavalry Regiment, 172nd Stryker Brigade Combat Team, stationed in Wainwright, Alaska, were part of "Operation Bootheel," which paired them with U.S. Border Patrol agents in southwest and south-central New Mexico. "They're a cav unit, so their job is to observe and track the enemy and then...