[2] Gadet began his military career from 1981 to 1983 in the Sudanese expeditionary contingent deployed to help Iraq in the Iran–Iraq War.
[3] General Gadet was a commander in the Sudan People's Liberation Army (SPLA) during the Second Sudanese Civil War.
In April 2011 Gadet emerged as leader of the South Sudan Liberation Army (SSLA), a new rebel group demanding a more broadly-based government.
[10] On 11 August 2015, Gabriel Tang,[11] Gathoth Gatkuoth, former Sudan People's Liberation Movement-in-Opposition (SPLM-IO) logistics chief, and Gadet announced that they had split from Machar, believing him to be "seeking power for himself".
[2] He was also on the board of advisers of the US-based Jarch Management Group, which has obtained oil concessions on large areas of land in South Sudan.