Me and @CaribbeanNinja played Sensor Net the other day.
The wording is curious - it seems to imply that picking up a token isn't voluntary.
In this it's worded differently from, say, Dangerous Territory. DT uses the 'may' term.
Objectives are not normal upgrades. They are not voluntary to resolve, are they? If it doesn't say 'may' it's actually a must, np? Otherwise stuff like Minefield won't trigger, as the player would just decline to trigger them.
So what sayeth ye? Voluntary or not?
I'm pretty sure its NOT voluntary.
(if you can't understand why you might want to not pick up a token, move along)