Possible Clues:

• They have served in the armed forces
• November 11 honorees
• Some parade marchers
• Old hands putting chopped-up tree into transporters
• Ex-army men or seasoned performers
• Old soldiers never sat around
• They're old soldiers entering wrong events
• They're old enough to make 23 down saner
• Are there ever ants as old as they?
• This puzzle's honorees, one of which is spread out in each of the four longest answers