ΔE 11.1, fair: the same colour family, but not a straight swap. Military Green is a little lighter than Battlefield Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Military Green is a little lighter than Battlefield Brown.
The same difference applies the other way round: Battlefield Brown is a little darker.
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 Battlefield Brown on the colour wheel See Military Green on the colour wheel
All matches: Battlefield Brown equivalents · Military Green equivalents