2. Amphibious Assault Vehicle, AAV-7A1 (Amtrac)
Joined the Service: 1972Producer: United Defense Price: *$5.5 million The Amtrac, formally the AAVP-7A1, is an amphibious assault carrier, not rail transport. Used primarily by the U.S. Marine Corps, this tracked vehicle transitions from ship to surf to shore while moving troops and gear. Since 1972 it has anchored amphibious operations with dependable performance in mixed environments. Its dual medium capability keeps it relevant to modern expeditionary doctrine.

AAVP-7A1 Amphibious Assault Vehicle (Amtrac) Source: Facebook.com / Alfonso Meo The AAVP-7A1 provides a 300 mile land range and about 20 miles at sea, suiting assault waves. Rated for Sea State 5, it endures rough conditions. Built by United Defense, it mounts an M2HB .50 caliber machine gun for supporting fire. Its blend of water entry, protected lift, and fire support keeps it vital in littoral missions.
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Energy-efficient idea.
Can we quantify impact?