Amid the potential of the US entering WWII, American Samoa emerged as a linchpin in the Pacific defense strategy. With tensions rising and rumors of a Japanese attack swirling, the Marines swiftly fortified the island, constructing defenses, coastal emplacements, and antiaircraft positions. To bolster their forces, the Marines established the 1st Samoan Battalion, comprising native recruits who played an instrumental role in defending their homeland.

The Marines' presence in Samoa grew to over 10,000 strong, transforming the islands into a training ground for future battles. Their efforts helped safeguard communication routes and acted as a deterrent against potential aggression.