This land component, now called the National Army, inherited by both its organizational structure of the National Guard organized by the US occupation forces, which operated from April 7, 1917 until June 1921, when it becomes Dominican National Police by Executive Order No. 631 of Rear Admiral Thomas Snowden, who was at that time the military governor of Santo Domingo. After the US military occupation in 1924, Horacio Vásquez wins the presidential elections of that same year. Among his first decisions, decrees the change of the Dominican National Police in National Brigade, a situation that continues until 17 May 1928, when new turn changes the name of the Army by Law No. 928, but basically inheriting a structure Police, who obeyed schemes imposition of public order demanded by the country at that time and not those of an army in their typical roles.