NATIONAL HARBOR, Md., Sept 15 Aerojet Rocketdyne Holdings Inc on Tuesday said it expected to complete its new AR-1 rocket engine by 2019 to replace a soon-to-be banned Russian engine, but the date could slip if it does not receive enough U.S. government funding.
What is the relationship between 'Aerojet' and 'rocket engine' in the context of the input sentence.
Options: product/material produced, developer, location of formation, manufacturer