Brainstrust,
as my son doesn't believe me (shocker) I need an independent ruling.
Firing Proton Rockets, he hits with 4 red dice.
I then roll four evades, no damage for me.
He now claims that Munitions Failsafe means he keeps the Proton Rockets, while I claim that he loses them.
Judgement required before play can resume. Fathers and Sons at war, it ain't pretty.
He keeps them. The weapon only 'hits' if it does at least one damage to the defender. If you cancel all of the attack dice, then it misses.
Thank you, crisis averted. Although my son being right may change the balance of power in the house.
Damage is not a requirement for being "hit". Uncaceled hit or crit results are. You could have a ship with "draw their fire" near by and the target could end up takeing no damage and still be considered "hit" by the attack.
In the OP's example though, there where no uncanceled hits or crits so he was not "hit" and munitions failsafe kicks in.
Unless he fired with Lt Blont, in which case he is always hit, and munitions failsafe is a wasted upgrade.
Thank you, crisis averted. Although my son being right may change the balance of power in the house.
The student has become the master?
Incidentally, the rules for what a "hit" is are on page 12 of the rulebook, under the "compare results" step.
Damage is not a requirement for being "hit". Uncaceled hit or crit results are. You could have a ship with "draw their fire" near by and the target could end up takeing no damage and still be considered "hit" by the attack.
In the OP's example though, there where no uncanceled hits or crits so he was not "hit" and munitions failsafe kicks in.
Ignore this, I misread the post 
since we are on the subject:
Munition fail safe + cluster missle...you have to "miss" with both rolls?
Munitions failsafe + Flechettte torpedo you "miss" and they still get a stress token...and you still get to keep your torp.
Munition fail safe + cluster missle...you have to "miss" with both rolls?
Yep. Covered in the FAQ under Cluster Missile's entry.
Munitions failsafe + Flechettte torpedo you "miss" and they still get a stress token...and you still get to keep your torp.
Also yep, and also covered in the FAQ under the entry for Flechette Torpedoes.