Infantry is the largest formation of the Singapore Army, comprising six active battalions—the 1st, 2nd, 3rd, 5th, 8th and 9th Battalions, Singapore Infantry Regiment (SIR)—based in Clementi Camp, Kranji Camp III, Maju Camp, Pasir Laba Camp, Mandai Hill Camp, Selarang Camp and, an undisclosed number of reservist battalions. The Infantry formation shares the same command as that of the Singapore Army's 9th Division.
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The 9th Singapore Division (9 DIV) is a combined arms division of the Singapore Army. It shares the same command as the Infantry formation of the Army.
The Singapore Army is the land service branch of the Singapore Armed Forces (SAF). The largest of the four branches of the SAF, the Singapore Army traces its origins to the 1st Battalion, Singapore Infantry Regiment (1 SIR), which was formed in 1957, under British colonial rule. After Singapore's independence on 9 August 1965, the Singapore Army Bill was passed in Parliament on 23 December 1965, and National Service (NS) was subsequently introduced in 1967. Mostly made up of conscripts, the Singapore Army can mobilise all operationally-ready military reservists in the event of war or national exigencies.