While Raleigh is being shown around the shatterdome he asks Pentecost what the strategy is, the Field Marshal describes using a nuke and having a 'plan'.
Raleigh: Wait, running point on what? You haven't told me what I'm doing here yet.
Pentecoste: We're going for the Breach, Mr. Becket. We're gonna strap a 2400 pound thermonuclear warhead to Striker's back. Detonate an equivalent of 1.2 million tons of TNT. And you and two other Jaegers will be running defense for them.
Raleigh: Thought we were the resistance. Where'd you get something that big?
Pentecoste: See the Russians back there? They can get us anything.
Raleigh: Sir, we've hit the Breach before. It doesn't work. Nothing goes through. What's changed?
Pentecoste: I've got a plan. I need you ready.
Raleigh said they'd already "hit the breach" so what exactly was Pentecost planning to do different before Newt and Gotleib interrupted with the new information?