From 1955 to 1958, Dwyer served as an instructor at Marine Corps Schools, Ouantico, followed by a tour of duty in London on the staff of &lt;a href="United%20States%20Naval%20Forces%20Europe"&gt;CINCNELM/CINCUSNAVEUR&lt;/a&gt;, After attending the Armed Forces Staff College, he joined the 2nd Marine Division and assumed command of the 2nd Battalion, 6th Marines as Assistant Force Marine Officer, Amphibious Plans and operations officer. While in this assignment he participated in contingency operations in Lebanon in 1958. He was deployed to the U.S. 6th Fleet as commander, Task Force 62 (Landing Force) and later was deployed as the commanding officer, Battalion Landing Team (BLT) 2/6 during the Cuban contingency operations.