ΔE 14.8, fair: the same colour family, but not a straight swap. Tan (USAF) is a little lighter, more saturated than Paratrooper Tan.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Tan (USAF) is a little lighter, more saturated than Paratrooper Tan.
The same difference applies the other way round: Paratrooper Tan is a little darker, more muted.
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 Paratrooper Tan on the colour wheel See Tan (USAF) on the colour wheel
All matches: Paratrooper Tan equivalents · Tan (USAF) equivalents