Afghan crossroads

February 3rd, 2010 07:41 AM ET KABUL, Afghanistan  – The next key U.S. military operation in Afghanistan will focus on Marjah, the last major Taliban stronghold in Helmand province, a Marine commander said Wednesday. Col. George Amland, the deputy commander of Task Force Leatherneck, gave no timeframe for its start. Marjah, with a population of up…