Green chevrons on troop card, what does that mean?

[knegrum]

some of my troops have green chevrons on them, someone enlighten me pls :-)

[Mickmane]

Check event thing to the left of main world map.

[knegrum]

ahhh, ty very much

[Blackwall]

It means they are the bonus troop for the weekly event. Check the event info on the left.