Answer
South Sudan People's Defense Forces (SSPDF) is the current name of the SPLA/M, which stands for Sudan People's Liberation Army/Movement. The SPLA/M was the armed wing of the Sudan People's Liberation Movement, a rebel group that fought against the Sudanese government during the Second Sudanese Civil War. After the war ended in 2005, the SPLA/M was integrated into the Sudanese Armed Forces.