BAGHDAD, Iraq - After nearly 40 years of battlefield service around the globe, the M-16 may be on its way out as the standard Army assault rifle because of flaws highlighted during the invasion and occupation of Iraq (news - web sites). U.S. officers in Iraq say the M-16A2 — the latest incarnation of the 5.56 mm firearm — is quietly being phased out of front-line service because it has proven too bulky for use inside the Humvees and armored vehicles that have emerged as the principal mode of conducting patrols since the end of major fighting on May 1....