The Banana Wars were a series of occupations, police actions, and interventions involving the United States in Central America and the Caribbean between the Spanish–American War (1898) and the inception of the Good Neighbor Policy (1934). These military interventions were most often carried out by the United States Marine Corps. The Marines were involved so often that they developed a manual, The Strategy and Tactics of Small Wars, in 1921. On occasion, the Navy provided gunfire support and Army troops were also used.