She carried helicopters and a detachment of embarked Marines for use in the Navy's "vertical envelopment" concept of amphibious operations.

One of the weaknesses of a vertical envelopment was that you couldn't drop the necessary tanks, large-bore artillery, or engineer and other heavy equipment.

The Marines used the term "vertical envelopment" instead of "air mobility" or "air assault".

It may mean airdrops or vertical envelopment to hold key points of terrain.

So they're going to have to try vertical envelopment.

So that leaves vertical envelopment.

Refining the concept for several years, Marines would use the term "vertical envelopment" instead of "air mobility" or "air assault".

This led to the concept of vertical envelopment (originally conceived for airborne), in which the enemy is not flanked to the left or right, but rather from above.

HMX-1 performed its first vertical envelopment from the deck of an aircraft carrier in an exercise in 1949.

This exercise was the culmination of the Marines' developing strategy of vertical envelopment rather than amphibious assaults on heavily defended beaches.