The Halo series and its campaigns have always featured a variety of collectibles to find. It's no different in Halo Infinite, and it includes skulls, audio logs, and more. There are many areas on the map during its open world segments where players can find them. One location is the tower.
Opening your tactical map in Halo Infinite will show you all the collectibles on each level. For The Tower, there are two Spartan Cores, a Mjolnir Armor Locker, an UNSC Audio Log, and a Banned Audio Log. Here's where to find all of these collectibles in The Tower.
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The skull from The Tower mission is easy to locate but slightly harder to acquire. It is located at the very top of the rooftop tower. You can fight your way up here, but if you're not in a hurry, you can wait until you get a flying vehicle to get up here.
As soon as you enter the courtyard of the Tower, turn right. You will see a container open. Inside this container is the Banished Audio Log resting against the wall.
The UNSC audio log is inside the tower. After taking the grav elevator, go up a flight of stairs. Circle until you hear the audio log beep. It's in a room off the side of the main hallway.
There are two Spartan cores here. The first is inside an open crate to the right of the gravolift. The second is one floor above where the UNSC audio log was. It's in a room on the right; just keep an eye out for the green lights on the core.
The Mjolnir armor locker is hidden under the landing pad at the end of the tower. It's easiest to spot by standing on the roof of the leftmost building. Just attack it to get it back.
For more information on Halo, check out Where to find the seven Forerunner artifacts in Halo Infinite Campaign - Haruspis Secret Achievement and What do the red switches do in the House of Reckoning advanced training room in Halo Infinite Campaign? on Pro Game Guides.