with long sleeves in winter and short sleeves in summer. A black tie is worn with the long-sleeve shirt. Some also wear black sweaters in cold weather. Class A uniforms consist of a dress blouse and Sam Browne belt. The ranks of trooper first class, corporal, sergeant, and first sergeant wear yellow chevrons showing their rank on both sleeves. Members of certain specialized units wear a military camouflage work uniform. A felt Stetson hat is worn in the winter months with a long sleeve shirt and tie, and a straw Stetson is worn in the summer months with the short sleeve shirt. Maryland State Police troopers are issued the Glock 22 chambered in 40 S&W, replacing the Beretta Px4 Storm and a Remington 870 shotgun. Qualified troopers are also issued the Colt M16-A1 or the Colt AR-15 semi-automatic rifles. Vehicles Troopers patrol in marked or unmarked vehicles. Early marked patrol units were olive green with black fenders. Beginning in 1972, vehicles (including helicopters) were painted yellow. Beginning in about 1984 new vehicles were painted tan with black and olive side stripes from front to rear. In approximately 1996, the agency changed back to the historic colors, and painted vehicles with most horizontal surfaces olive green and most vertical surfaces black. MSP currently operates a fleet consisting of the Ford Police Interceptor Utility, Ford Police Interceptor Sedan, Chevrolet Caprice 9C1, and Chevrolet Tahoe PPV, with the Ford Crown Victoria Police Interceptor being phased out of service. Most newer vehicles are painted in the traditional green over black paint schemes, however, some are painted all black with traditional MSP lettering. All marked patrol vehicles contain the Maryland State Police Shield on both the driver and passenger door as well as "State Trooper" decals on the fenders and rear of the vehicle. Trooper's vehicles are not equipped with prisoner cages. Prisoners, by policy, are transported in the front seat. Most vehicles assigned to patrol functions are equipped with mounted radar units, in-car mobile data terminals, printers, and barcode scanners that allow troopers to access various law enforcement databases as well as provide the hardware support for the MSP's Etix electronic citation program. This setup enables troopers to spend more time on patrol as they are able to complete reports through an internet-based computer-aided dispatch / report management system. Training The Maryland State Police Training Academy is in Sykesville, Maryland, along with the Maryland