With the 2022 update to NATO’s AJP-01 Allied Joint Doctrine, mission command was elevated from an important component of a joint command philosophy to the alliance’s overarching command philosophy – a shift in written doctrine raising concerns about its practical application across the multinational force. This study explores the gap between written doctrine and operational practice, highlighting the complexities of implementing mission command within NATO’s diverse military landscape. Through 33 interviews with NATO senior leaders, the analysis highlights challenges in achieving human interoperability in a multinational environment. We show that NATO commanders lack some of the mechanisms held in the literature to be efficient means to ensure its implementation in national settings. Ultimately, while the doctrinal emphasis on mission command is a positive step, its successful implementation requires operational commanders across the NATO command structure ensure that doctrine is read and discussed, and that training activities designed to facilitate prudent risk-taking are arranged. Finally, we call for a focus on the use of simple language to promote mutual understanding. These steps might aid the transition from paper to practice, and enhance human interoperability.