as a reserve signals battalion for the 6th Division (6 DIV). On 9 October 1978, the 9th Signal Battalion (9 SIG) was formed in Slim Barracks to train reservist signallers for the 9th Division (9 DIV). On 1 March 1982, HQ C&E was reorganised to form HQ Signals. HQ Signals relocated to Stagmont Camp in 1988. Stagmont Camp, which used to be known as Kranji Wireless Station when it was used by the British Armed Forces as a high frequency transmitting station, then housed the 2nd Signal Battalion (2 SIG), the School of Signals, the Reserve Signal Training Centre, and HQ Signals. In October 1982, the MINDEF Signal Battalion was renamed 1st Signal Battalion (1 SIG). In 1985, the Reserve Signal Training Centre took charge of 6 SIG and 9 SIG, which both trained reservist signallers. In 1987, 9 SIG moved from Slim Barracks to Selarang Camp, where HQ 9 DIV was located. In 1991, after 6 DIV was converted to a combined arms division, 6 SIG was placed under HQ 6 DIV in Mandai Hill Camp. On 31 March 2003, the Signal Institute (SI) was formed as an amalgamation of the School of Signals, Signal Training Centre, and the training branch of HQ Signals. In 2004, the Signals formation developed the Integrated Knowledge-based Command and Control (IKC2) concept as a new way of perceiving command and control. In 2006, HQ Signals was redesignated as HQ Signals and Command Systems. In 2010, the Command, Control, Communications, Computers and Intelligence, Surveillance and Reconnaissance (C4ISR) battalions were created to enhance the Singapore Armed Forces' capabilities. Operations The Signals formation has participated in humanitarian aid operations. In the aftermath of the 1990 Luzon earthquake in the Philippines, signallers were deployed to Baguio and Cabanatuan to support the Singaporean medical relief team there and distribute medicine to affected villages in those two cities. For about two months in 1991, signallers were also sent to Kuwait to provide communications support for the United Nations humanitarian mission during the Gulf War. Organisation The Signals formation comprises HQ Signals and Commands Systems, the Signal Institute (SI), and an undisclosed number of active and reservist battalions. Each of the Singapore Army's combined arms divisions – 3rd Division, 6th Division and 9th Division – has a signals battalion attached to it, and every brigade within each division also has a signals company attached to the brigade's headquarters. HQ Signals