I'm flying ORD-IAD-ADD-BJM and I would imagine that I will get a boarding pass all the way through. Will it be possible to get the layover voucher from the gate in IAD? Is it worth going through security again just to get the voucher?
They should give you the voucher at the gate in Dulles (ask when boarding), but if not you can collect it in Addis without any hassle presuming you are eligible.