It's been a big week for Coast Guard Cmdr. Thad Allen, who is in charge of overseeing the federal response to the BP oil leak. This morning, he announced that BP's "top kill" is working, halting the flow of oil into the Gulf of Mexico since last month's Deepwater Horizon explosion. But earlier in the week, with far less media attention, Allen, 61, stepped down from his position as Commandant of the Coast Guard, the highest position in that branch of the military. He had plans to retire soon after being relieved of command, but was instead tapped to run...