According to the Watson Institute of Brown University, 4,424 U.S. soldiers have died in the post-9/11 wars in Iraq and Afghanistan through February 2023. However, please note that the number of soldiers who die each year can vary and change over time based on various factors such as ongoing military operations and any casualties that may occur throughout the year. For the most current and accurate information, I recommend referring to up-to-date official sources such as the United States Department of Defense or other relevant organizations that track these statistics.