The IDF’s Har Zion 0710 Unit represents a unique phenomenon in modern military history: hundreds of Israelis aged over 45 years old, many decades past their military service, have voluntarily returned to uniform to defend their nation. The unit was spontaneously established overnight after Oct 7 2023.

https://www.jns.org/how-israels-veteran-civilians-returned-to-the-front-with-the-har-zion-unit/