"To the American People,
"We are former public servants who swore an oath to the Constitution. Many of us risked our lives for it. We are retired generals, admirals, senior noncommissioned officers, ambassadors, and senior civilian national security leaders. We are Republicans, Democrats, and Independents. We are loyal to the ideals of our nation—like freedom, democracy, and the rule of law—not to any one individual or party.
"… First, we believe America’s national security requires a serious and capable Commander-in-Chief. Second, we believe American democracy is invaluable. Each generation has a responsibility to defend it. That is why we, the undersigned, proudly endorse Kamala Harris to be the next President of the United States.
"This election is a choice between serious leadership and vengeful impulsiveness. It is a choice between democracy and authoritarianism. Vice President Harris defends America’s democratic ideals, while former President Donald Trump endangers them."
https://www.nsl4a.org/nsl4a-announcements/nsl4a-endorsement-harris-update