LAY SUMMARY Taking as a starting point that sex and gender are not the same thing, a principal understanding of Gender-Based Analysis Plus (GBA+), this article reviews research published in 2020 on the health and well-being of Veterans and currently serving members of the Canadian Armed Forces. The purpose of this review was to see how sex and gender were referred to in this published literature. The published research tended not to differentiate between sex and gender, often using the two terms as though they referred to the same thing. Possible reasons for why this has happened are explored, as is the importance of treating sex and gender as fundamentally different things.