Thank God. They were paying a fortune for “renewable” Jet fuel, when we are swimming in oil again.
They also had “test ships” using “algae fuel” at nearly $424/gal.
https://www.reuters.com/article/us-usa-defense-greenfleet/great-green-fleet-using-biofuels-deployed-by-u-s-navy-idUSKCN0UY2U4