When selecting a valid target, operatives cannot use terrain for cover. If the rule is Seek Light, operatives cannot use Light terrain for cover. Whist this can allow such operatives to be targeted (assuming they're visible), it doesn't remove their cover save (if any).
You can re-roll one of your attack dice.
The defender cannot retain cover saves.
Saturate weapon rule.
Balanced weapon rule.
The target cannot be obscured.
Seek Light weapon rule.