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

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.
product/material produced