On 23-24 October 2025, the the NATO Cooperative Cyber Defence Centre of Excellence (CCDCOE), together with the War Studies Research Centre (WSRC) of the Netherlands Defence Academy (NLDA) and the Amsterdam Center for International Law (ACIL) of the University of Amsterdam organised a conference on the law applicable to the use of biometrics by armed forces. This conference, held at CR14 in Tallinn, followed and built on the conferences that took place on the 25th of May 2023 in Amsterdam and 7-8 May 2024 in Tallinn on the same topic. The conference brought together around 50 practitioners and academic experts to discuss legal questions arising from the military use of biometrics. This document is intended to serve as a brief report of the conference.