Two defense officials familiar with the planning said the rapid response force, consisting of 2,000 Marines and sailors, is being sent. It will join a growing number of US warships and forces converging on Israel as the US seeks to send a message of deterrence to Iran and the Lebanese militant group Hezbollah.1
US Secretary of Defense Lloyd Austin ordered that roughly 2,000 troops prepare for a potential deployment to Israel.
https://edition.cnn.com/2023/10/16/politics/us-marines-pentagon-israel/index.html