Mission 10: Downtown District
The crash has left Sam in the theatre and with a broken EMP device, although in exchange he receives a nice vest that increases the capacity of the other gadgets by one. Immediate access to the streets gets barred off by a myriad of armed sentries watching the theatre lobby. As Sam approaches the lobby, move to the wider entrance in the middle and mark a couple of targets. One of them comes close enough to Sam for a stranglehold and subsequent acquisition of an Execute. Proceed to Execute the four targets, then lob a Frag Grenade or two to take out the rest. This should clear up the room and let Sam through to the streets.
Walking through the crowds on the streets reveals just how Reed's diabolical scheme has reaped nothing but chaos. Eventually, Sam ducks into an alley and the mission proceeds.
Get to the White House.
Press up against the wall as a civilian gets denied entry to a closed-off area. While the guard weaves some bullcrap to settle the civilian's nerves, slink past them to the vertical pipe and shimmy around the building. Drop to the ledge and shimmy across to the inside of the other building, all the way to the end. Drop down into the shadows and, making certain that it's safe to do so, carefully ease past the stationary guard here by staying within the darkness and hugging the wall to the right. If all goes well, Sam slips past all the guards and continues down the street to a Weapon Stash along the left side.
A huge throng of innocents have gathered in front of a heavily defended barricade. It's an automatic gameover if any civilians are killed, but once a gunfight is incited they scatter like roaches, which allow the freedom to go wild. As the guy with the microphone blabs on, proceed down the right sidewalk to come to a ladder. Crawl under, ignoring the temptation to climb up it for now, and snag an Execute from the sentry here (but do it in the darker end). Jump atop the scaffold that overlooks the entire area to get a clear idea of the spread. On Realistic, there are seven guys to deal with. Mark any four targets near the fence, then throw a Remote Mine near the two guys by the truck in the back. Detonate, then Execute. The aftermath should leave only one guy alive, whom can be dealt with in a leisure fashion.
Get through the gate and onto the White House grounds.
A big, red oil rig is parked outside the White House gates, but before blowing it up stay along this side of the street and move to the far right. There's a guy to take out for an Execute. After the flashy diversion, sneak past the guards and into the front yard that's crawling with more guards. Climb atop the roof of the building for a good vantage point. Burn through these hooligans and continue to the White House.
Get a Frag Grenade out and roll it down the center of the street, where a bulk of them charge out and get demolished by a well-placed grenade. Most, if not all, should have been wiped out by the explosion. Moving past these barricades, Sam comes across more enemies, but staying on the left and in the shadow of the Hummer can veil him from immediate detection.
Reed has locked down the front entrance of the White House, but luckily Grim has all the bases covered and opened up the side garden door for Sam. He only has to slip past the remaining guards to get to it. Simply throw a Flashbang and make a break for the door amid the bright confusion.