Here is the twitter video of Corporal James Hung reading a recall letter.
https://twitter.com/DonnaPrissyrn1/status/1786913026718711894
There is an active PDF on the Army website that was recently published
"UTILIZATION OF THE ARMY RETIREE RECALL PROGRAM"
Here is the Army website:
https://armypubs.army.mil/ProductMaps/PubForm/Details.aspx?PUB_ID=1028611
Here is the PDF:
https://armypubs.army.mil/epubs/DR_pubs/DR_a/ARN40510-ALARACT_0172024-000-WEB-1.pdf
Note that the PDF mentions 2 Executive Orders,
EXECUTIVE ORDER 13223, was written by Bush in 2001 in response to 9/11. This EO was responding to acts of terrorism.
EXECUTIVE ORDER 13814, was written by Trump in 2018 and it amended Bush's EO 13223.
"Executive Order 13223 is amended by adding at the end: "The authorities available for use during a national emergency"
https://www.presidency.ucsb.edu/documents/executive-order-13814-amending-executive-order-13223
Edit: I deleted and reposted, I had stupid spelling errors in the first title.
Kek.