Rob Lynch enlisted in the Australian Regular Army in August 2008, where he was allocated to the Royal Australian Infantry and served with the 3rd Battalion, Royal Australian Regiment. In 2015, he transferred to the Australian Intelligence Corps and rose to the rank of Corporal. During his time in the Intelligence Corps, Rob served with the 1st Intelligence Battalion, Special Operations Command, and Headquarters 3rd Brigade. In January 2024, Rob began training at the Royal Military College – Duntroon and was commissioned in August 2024 as a Lieutenant in the Royal Australian Corps of Signals.