Another US amphibious warship is out of commission as mechanical failures continue to plague the Navy's fleet

• Wasp-class amphibious warship USS Iwo Jima returned to port due to a major mechanical failure.
• The Navy had at least three incidents this year with its amphibious fleet facing mechanical issues.
• USS Boxer and USS Wasp returned to port earlier this year due to rudder issues and propeller damage.

One of the Navy's amphibious warships suffered a major mechanical failure earlier this week that forced it to return to port -- at least the third such incident this year.