Museum Square Rooftops is the sixth chapter of the fifth act in Gears of War: Judgment.
As you get closer to the Museum Baird comments that to kill Karn they needed to sacrifice Troy, which he regrets as he had grown fond of him. Omega sends another transmission with Marcus stating that they don't have much time left. There'll be some Retro Lancers inside the room. The Declassified Mission shall be inside too.
"Kilo Squad claimed to have seen and avoided Reaver forces using tactics internal COG intel does not support."
Activating the mission will require you to finish the chapter in 2 and a half minutes or else you will be killed by a large Reaver attack.
Open the door and you'll find a Locust emplacement with more Kantus and Shriekers nearby, take care of the turret, then finish of the Shriekers and Kantus, use Grenades and other powerful weapons to deal with them as you won't have much time. More Locust will rappel down and join the fight, tale them out before time runs out and head upstairs to finish the chapter.
Left to the turret's position, you'll find an Onyx ammo cache and an explosive along with a COG Tag on the floor.
|Gears of War: Judgment Walkthrough|
|Gears of War: Judgment||Act I · Act II · Act III · Act IV · Act V · Act VI · Act VII|
|Act I||Old Town · Riverwalk District · Museum Gardens · Great Hall · Kashkur Wing · East Wing · Archives · Vaults|
|Act II||Enfield Bridge · Courtyard · R&D Labs · Monroe Commons · Atrium · Crash Site|
|Act III||Amador Park · Magadha Villa · Soleno Villa · Windward Way · Risea Estate · Guest Bungalows · Elliott's Mansion|
|Act IV||Fortress · Container Terminal · Motor Pool · The Cliffs · Central Base · Central Control · Beach|
|Act V||Wharf District · Parade Grounds · Upper State Street · State Street Rooftops · First Avenue Rooftops · Museum Square Rooftops · Overlook|
|Act VI||Grand Courtroom · Halls of Judgment · Terrace · North Entrance · Main Entrance · Great Staircase · Plaza for the Tyran Dead|
|Act VII||Reunion · Anybody Home? · Dead End · One Step Closer · Straight to the Top · A Few Complaints|