The letter endorsing Harris consists of 741 former high-ranking national security officials, including 233 general and flag officers. Among those 741 officials are 15 four-star generals, 10 former Cabinet secretaries and 10 service secretaries as well as leaders who served in Republican administrations.

“We do not agree on everything, but we all adhere to two fundamental principles,” the letter reads. “First, we believe America’s national security requires a serious and capable Commander-in-Chief. Second, we believe American democracy is invaluable.”