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.
Analyze the relationship between 'Aerojet' and 'rocket engine' within the context of the input sentence.
Options: developer, manufacturer, location of formation, product/material produced