upcoming models. The party included a performance from rapper Eminem. On 1 September 2017, Casio celebrated its 100 millionth sale of G-Shocks worldwide. Models The line of watches now includes atomic clock, GPS and Bluetooth time synchronisation and tough solar technology. Many newer models feature metal (steel or titanium) bands and a mix of analogue-digital timekeeping, analogue timekeeping or digital timekeeping. The DW models are standard battery-powered G-Shocks while GW models of the G-Shock come with either Tough Solar or Multi-Band atomic timekeeping or both. Models with "B" prefix in their model name before the number are bluetooth enabled while those having "P" prefix in the model name before the number have GPS time reception or navigation capabilities. Twice a year, the basic models are updated. New limited models are introduced more frequently throughout the year. Special models are released upon the anniversary celebration of the G-Shock brand and are sold through selected retail channels. Casio also produces collaboration models, often with popular fashion brands and artists, like A Bathing Ape (Bape), Stüssy, Xlarge, Eric Haze, KIKS TYO, Nano Universe, Levi's, Lifted Research Group, as well as Coca-Cola, Pulp68 Skateshop, Lucky Strike and Marlboro. G-Shock watches are popular with mountaineers, firefighters, paramedics, people working in the offshore, police officers, astronauts, film directors (Tony Scott was often pictured wearing a GW-3000B, as are Ron Howard and Francis Ford Coppola) and soldiers. Ex-Special Forces-British SAS soldier Andy McNab mentions in several of his novels how his character Nick Stone relies on a G-Shock watch. According to Mark Bowden's book Blackhawk Down, the DELTA Operators wore G-Shock watches during the combat events of 3 and 4 October 1993. Since then, G-Shock watches have become very popular with Special Forces groups in both American and other NATO nation units, due to being "battle tested". The DW-5600C, DW-5600E, DW-5900, DW-6600 and DW-6900 models are flight-qualified for NASA space travel. Casio has updated the DW-5600E module, replacing the usual 1545 module with module number 3229 (in 2010) increasing the full-auto calendar to the year 2099 instead of 2039 in the previous module. In 2009, Casio introduced the GW-M5610, a solar powered variant of the DW-5600 incorporating Multi-Band 6 time reception technology and a design homage to the original DW-5000C which was an update to the earlier GW-M5600 model. The GW-M5610 would spawn many variants, the most notable being the GW-5000 which was a steel cased screw-back