It means that unless you are retiring, leaving the service, or have a Permanent Change of Station (PCS) already in progress you are staying at your current command/ location until further notice.
This is a low cost effort to further slow the spread of the CV.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)