The Czech Republic’s government formally announced that it would replace its current fleet of Swedish JAS-39 Gripen fighter jets with the Lockheed Martin F-35 Lightning II.

Local news station Czech Radio said Defence Minister Jana Černochová and US Ambassador to the Czech Republic Bijan Sabet signed an agreement for 24 F-35 stealth fighter jets. The deal is valued at 150 billion Czech koruna (or $6.6 billion), and is considered the largest single purchase for the Czech military.

“By signing this intergovernmental agreement, our country and also our army enter a new era,” Černochová said