So what happens if you use the Intel officer on a defence token and then use the overload pulse critical effect To exhaust all defence tokens?

Is exhausting a token the same as spending it?

Thanks

Well both effects would happen, but exhausting is not spending. So Intel would trigger and if they spend that token it gets discarded, then overload pulse would trigger and flip any green tokens to red

So nothing special would happen

Just to put what clontroper5 said into steps:

1. You declare the target of your attack

2. You roll the dice in your attack dice pool

Between step 2 and 3 you would use Intel Officer to nominate a defense token

3. Resolve any attack effects (modify dice, spend Accuracy icons)

4. Defender spends defense tokens

5. Resolve damage

In step 5 you would use your Overload Pulse critical effect. Had the defender used an Evade token and removed your blue critical result (and assuming you had only the one blue critical), Overload Pulse would not trigger. But if a blue critical was part of the resolve damage step, then any green defense tokens would be turned to red, and any red defense tokens would not be otherwise affected.

Exhausting a token is not the same as spending it, though it is functionally very similar. You can find this info on page 4 of the Rules Reference, but the summary goes like this.

A green token is a readied token. If you spend a readied token, it is flipped to its red side — this is exhausting the token. You can spend an exhausted token, but if you do you lose it for the rest of the game. So basically, you do not exhaust a token to spend it, but you spend a token to exhaust it. I hope this makes sense.