As President Obama ushers in the end of what he called America's long season of war," the former tools of combat - M-16 rifles, grenade launchers, silencers and more - are ending up in local police departments, often with little public notice. During the Obama administration, according to Pentagon data, police departments have received tens of thousands of machine guns; nearly 200,000 ammunition magazines; thousands of pieces of camouflage and night-vision equipment; and hundreds of silencers, armored cars and aircraft. The equipment has been added to the armories of police departments that already look and act like military units. Police SWAT teams are now deployed tens of thousands of times each year, increasingly for routine jobs. Police departments ... are adding more firepower and military gear than ever. Some, especially in larger cities, have used federal grant money to buy armored cars and other tactical gear. And the free surplus program remains a favorite of many police chiefs who say they could otherwise not afford such equipment. The number of SWAT teams has skyrocketed since the 1980s, according to studies by Peter B. Kraska, an Eastern Kentucky University professor who has been researching the issue for decades. Recruiting videos feature clips of officers storming into homes with smoke grenades and firing automatic weapons. In Springdale, Ark., a police recruiting video is dominated by SWAT clips, including officers throwing a flash grenade into a house and creeping through a field in camouflage.