The United States on Monday crossed the staggering milestone of 500,000 COVID-19 deaths just over a year since the coronavirus pandemic claimed its first known victim in Santa Clara County, California.

In a proclamation honoring the dead, President Joe Biden ordered the U.S. flag to be flown at half-staff on public buildings and grounds until sunset on Friday.

¡°On this solemn occasion, we reflect on their loss and on their loved ones left behind,¡± Biden said in the proclamation. ¡°We, as a Nation, must remember them so we can begin to heal, to unite, and find purpose as one Nation to defeat this pandemic.¡±