According to the study the US military emitted 23million t of CO2e and the world 54.49 billion t of CO2e. That means it is 0.05% of global emissions. Per soldier it is something like 17t. There are a lot of small countries in the world, so it sounds worse then it really is.
To put it another way, they did not forget. The US military just does not matter enough in the grande scheme of things.
EDIT: Saudi Aramco release nearly three times of this in scope1 and 2 emissions alone.
Here we go. Chinas economy is slowing down and it is finally happening. That hopefully means we have had peak emissions globally.