WASHINGTON (AP) — Military service members must immediately begin to get the COVID-19 vaccine, Defense Secretary Lloyd Austin says in a memo Wednesday, ordering service leaders to “impose ambitious timelines for implementation.”

Now that the Pfizer vaccine has received full approval from the  Food and Drug Administration, the Pentagon is adding it to the list of required shots troops must get as part of their military service. And according to Pentagon data, more than 800,000 service members have yet to get their shots.

LOOK: What major laws were passed the year you were born?

Data for this list was acquired from trusted online sources and news outlets. Read on to discover what major law was passed the year you were born and learn its name, the vote count (where relevant), and its impact and significance.