(Editor's note: This story has been updated with information obtained from an internal Pentagon acquisition decision memorandum and reflects the fact that the official AMPV request for proposals was released today.) The Defense Department has officially approved the Army's plans to launch the Armored Multi-Purpose Vehicle program, according to an internal Pentagon memo obtained by InsideDefense.com. Frank Kendall, the Defense Department's acquisition chief, signed an acquisition decision memorandum today clearing the Army to launch a competitive effort to...