FOB Geronimo is a former Forward operating base located along the Helmand River Valley in Nawa-I-Barakzayi District, Helmand Province, Afghanistan. It was originally built for 1st Battalion, 5th Marines (1/5) by Combat Logistics Battalion 8 (CLB8), of the United States Marine Corps in summer of 2009. 1st Battalion, 3rd Marines conducted a relief-in-place with 1/5 in December 2009.