On 5 February 1960, the KIO's private army raided a bank, among other activities. When Burmese authorities began responding to the KIO's actions, many young Kachin dissidents went underground to join the KIO. A year later on 5 February 1961, the KIO's 100-strong private army was reorganised into the Kachin Independence Army (KIA) and became the KIO's armed wing, with Zaw Seng as commander in chief. Following the 1962 Burmese coup d'état, the KIO expanded its armed wing with new recruits, who dissented against the new military junta under General Ne Win.