The one behind it all.

Sam only noticed after Zero Three mentioned it. The voice in the video was indeed that of the talking Calamity that killed the Valkyries from the forty fifth base and almost got Five as well.

The first question that came to mind was why? Why did she bother to make a declaration now? Why wait till humanity was on its last leg? 

As his mind began analyzing every part of what he had heard, Sam noticed that the young Valkyrie was trembling in the corner of his eye.

"Three?" 

Tears began to flow from her eyes as she cradled her head, her face painted with fear and horror. Seeing how she was about to crumble Sam tossed the tablet aside and quickly went to her side pulling her into his arms.

"It's okay." He said. "Everything will be okay."

Soon after he embraced her the young Valkyrie began wailing. Alice watched the scene from behind her desk, the confusion she showed was warranted.