Not a single word, but I'd say potential attackers. Here's an example in the wild from The New York Post:
France carries out raids, names more potential attackers
PARIS — French police raided 168 locations across the country and detained nearly two dozen people as authorities identified more members of a sleeper cell said to be behind the Paris attacks that killed 129 people.
Your example, albeit tautological, would go along the lines of:
"All the attacking units are potential attackers"
In this related post (Different way of writing “attackable” and “repairable”) there are some words that could fit the bill, such as potential aggresor or weaponisable, but they aren't etymologically related to "attack", if that's what you were looking for.