ΔE 6.8, close: similar, with a visible difference side by side. Medium Olive is more saturated, warmer than Green (USAF).
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Medium Olive is more saturated, warmer than Green (USAF).
The same difference applies the other way round: Green (USAF) is more muted, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Green (USAF) on the colour wheel See Medium Olive on the colour wheel
All matches: Green (USAF) equivalents · Medium Olive equivalents