Intel 16: After you meet the recon squad, you'll jump down to a firefight with a lot of troops. Some of them will be firing at you from the windows of the second story of a building. Fight your way into the building, climb the stairs to the second floor, and look into the bathroom there for the intel.
Safehouse
Intel 17: After heading up the forest path at the beginning of the level, you'll spot a large building on the right. After clearing it out, head up to the top floor and find the laptop on a dresser near a mattress on the floor.
Intel 18: There's a large restaurant/bar style building next to the water tower. The laptop is in plain site in one of the booths on the first floor, but can be difficult to spot due to all the weapons it's on.
All Ghillied Up
Intel 19: After eliminating the spotter in the square tower of the church, you'll enter the building itself. Climb up the ladder to the tower where he was stationed to find the intel.
Intel 20: When you reach the maze of cargo containers, there'll be a group of soldiers sitting around a few barrels off to the right. Macmillan will lead you around them, but the laptop is on the barrels, meaning that you'll have to start a fight to get to it. You can chuck a grenade into the middle of the soldiers, grab the laptop, then reload if you die.
Intel 21: After shooting the sniper off of the fire escape, walk up to where he was stationed and jump through the window to nab the laptop.
One Shot, One Kill
Intel 22: After Macmillan is wounded, start making your way through the level. Eventually you'll reach a building with soldiers and a couple of dogs inside, on the second floor. Clear the building out, make your way outside, then set Macmillan down and climb up the fire escape to find the laptop.
Intel 23: When you reach the end of the level, you'll be tasked with setting Macmillan down and letting him provide sniper support. Survive the first waves of enemies. When the helicopters come to unload more enemies, though, you can head up into the alley to the right of where you're probably facing. One of the backdoors to the building on the right side of that alleyway will have opened, revealing the laptop.
Sins of the Father
Intel 24: After you get on the dumpster to take out the snipers in the tower, cross the lot to the diner, head inside, and nab the intel off a table in one of the booths. You have to nab it before Price orders everyone to put on the Russian uniforms and the scene changes to daytime.
Intel 25: After Zakhaev runs off into the village, you'll follow him, then duck off into an alleyway to your left. Eventually you'll fight enemies on the other side of a metal fence, then fight off enemies on top of a rooftop. There's a building here with a set of steps leading up to its second floor; head up to find the laptop.
Ultimatum
Intel 26: After you destroy the power lines and cut through the gate, you'll come to a walled-in area where you fight multiple enemies, including troops that rappel down from choppers. After the fire drops down a bit, cross the yard and head into the building on the opposite side. In one of the small rooms on the first floor you'll find the laptop.
All In
Intel 27: As you proceed through the base, you'll head to the right and assault a gate that Price will blow up. Before heading through, check the alleyway behind the building to the right of the gate to find the intel.
Intel 28: During the firefight with the two BMPS (or after it), make your way to the southeastern corner of the silos. There'll be a hangar there with a laptop on the ground.
No Fighting In The War Room
Intel 29: After dropping into the bathroom, take the left exit and head past the locker rooms and dorms. You'll eventually come to a darkened conference room on the left side of the hallway; the laptop is on the table inside.
Intel 30: When you breach the missile control room, head up the stairs and enter the conference room there. The laptop will be on the table.