High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Singapore Infantry Regiment is the main formation of the Singapore Army. It consists of six full-time battalions and a number of National Service (NS), or Reservist battalions. The 1st Battalion, Singapore Infantry Regiment was formed in 1957 against the backdrop of self-government for Singapore. Recruitment began on 4 March 1957 with only Singapore citizens and persons born and bred in Singapore were recruited. Out of a total of 1,420 applicants, 237 were initially accepted for training. It was intended that 1 SIR together with another battalion would form part of a Regiment within a Brigade Group in the Singapore Military Forces.