veterans

/V EH1 T ER0 AH0 N Z/
noun
  1. 1

    A person with long experience of a particular activity.

  2. 2

    A group, animal, etc. with long experience of a particular activity.

  3. 3

    A person who has served in the armed forces, especially an old soldier who has seen long service; also called a war veteran to distinguish from veterans that weren't in armed conflict.

Source: https://en.wiktionary.org/wiki/veteran, https://en.wiktionary.org/wiki/veterans