Abstract: Fitness – both mental and physical - is an essential component of military fighting power. In addition, we know that evidence shows that Service personnel are more likely to successfully transition into civilian life if they are fit, have positive mental health, and are informed and prepared for their future lives. Significant progress has already been made to support the mental fitness of our serving community since the original project in 2020. Now, with the launch of HeadFIT v2, we are pleased to share this evaluation report. The report highlights the limitations and successes of the initial roll-out of HeadFIT, recognising how essential it is that mental wellbeing forms a core part of the lives of our Service personnel. Importantly, this report has also been utilised by the MOD when reviewing HeadFIT, and we are pleased to see the launch of HeadFIT v2 take onboard the recommendations outlined here.