Product called Rustall is a good choice.
Also I have found that if I want a good rusty wash for a part to show rust trails I will take some iron filings add water and wait for a week or so. hard water here at home so plenty of stuff to make the rust happen.
If you are seeing reddish streaks on an F-15 more than likely you are seeing Hydraulic fluid leaks.
this can be duplicated with a thin wash of the following ( not sure of the mix, because I mixed it way back in 87 when I was at Misawa AB Japan.
using Gunze Sangyo paints.Clear base, Clear Red, Clear Smoke, and some rubbing alchohol.
M