FILE - An F-35 fighter jet arrives at the Vermont Air National Guard base in South Burlington, Vt, Sept. 19, 2019. Switzerland’s defense department says any delay to a planned multibillion-dollar acquisition of U.S.-made F-35 fighter jets would have “grave consequences” for Swiss security. On Tuesday, Aug. 23, 2022 the Swiss government announced that campaigners had cleared the bar of more than 100,000 signatures of a petition by citizens calling for a referendum on the planned purchase of 36 of the Lockheed Martin-built jets. (AP Photo/Wilson Ring, File)