Sing Rattanasamai joined the Lao Issara independence movement and later was appointed as the original Lao Issara defense minister by Prince Phetsarath.
In October 1945, Sing joined the Lao Issara independence movement; he was given command of the civil guard in Vientiane. He was subsequently appointed as the original Lao Issara defense minister by Prince Phetsarath. 
