Even if nobody in your squad made it to target but were a credble force planned to attack it before T+60 then requirements were met. Happens all the time, when an outgoing strike runs across a forward fighter sweep by mistake. That strike gets anhilated, but still fills the requirement for having a strike heading to hit a required target before T+60.
I think the main point is that a the rule to hit by T+60 must be attempted to be followed. The Cic gives the order, and the squad plans to execute. What happens after lift off is a crap shoot. As others have already said, you can get jumped enroute to target and wiped out.
There have been cases where an incoming strike crossed an outgoing strike/sweep. It's too bad the outgoing force rarely has the discipline to call in the location and size of the incoming strike and continue on to
their objective, instead of being greedy and denying their own team's defense the opportunity to have
their own fun. I've been in a few frames on defense where we flew the whole night defending a base that was never attacked because of this very situation.
As far as the original query, I'd jump in guns and defend myself. As has been stated, the objective was tasked and attempted to be attacked by T+60, so the defenders were given the opportunity to see action within the first hour. The rules were satisfied. There should be no penalty if the strike didn't get bombs off. Since the T+60 rule was satisfied, there is no reason to not task another strike to this target with available forces that survived their own initial strike of another target.