
It isn’t just massive aircraft carriers anymore.
The following seems to identify them clearly:
For decades, when a crisis emerged anywhere on the globe, the first question a U.S. president asked was, “Where are the carriers?” Today, that question is still asked, but increasingly, it has morphed into, “Where are the expeditionary strike groups?” The reason for this is clear: These naval expeditionary formations — built around a large-deck amphibious assault ship, an amphibious transport dock, and a dock landing ship — have been the ones used extensively for a wide array of missions short of war, from anti-piracy patrols, to personnel evacuation to humanitarian assistance and disaster relief. And where tensions lead to hostilities these forces are the only ones that give the U.S. military a forcible-entry option.
VTO aircraft for close ground support and amphibious vehicles to take troops and equipment on shore.
Much more @ The U.S. Navy’s Amphibious Assault Renaissance: It’s More Than Ships and Aircraft