The idea of the gun pod as a concept largely came into its prime during and after World War II. So-called "package gun" installations on US medium and light bombers, such as the B-25 Mitchell and A-26 Invader, were probably the first such attempts by the United States military. One of the primary ideas was to provide additional suppression of ground defenses during attack runs, primarily while conducting maritime interdiction, and the extra armament gave the aircraft additional firepower.