The code letters actually go over what appear to be older, faded stripes if the profile is correct. I would:
1. Mask and paint the darker stripes.
2. Mask the dark stripes, except for the lighter areas, then spray on a clear coat cut with a drop of light grey paint. If brush painting, fade the black with a few drops of whit and apply over the darker black.
3. Apply the decals
EDIT: just went back to the beginning and saw the pictures and it appears the stripes go over the codes as Terry says. Not sure why that profile above is drawn that way. If that's the case, I would just cut the code decals in lengthwise and apply them butted up to the stripes.