Chapter 3 edits, part 3

“Hey! I'm useful! Just you see!” Skywarp defended himself, “trust me at being your thief in the night, or secret assassin!”

This should be two sentences: “Hey! I'm useful! Just you see!” Skywarp defended himself. “Trust me at being your thief in the night, or secret assassin!”

Also, "Just you see" doesn't quite make sense. How about "Just you wait and see!" or "You'll see!"?

Pursing his lips, Starscream sank deep in thought.

Can Transformers do this? Besides Arcee, who has lips?

Would they get stationed in different areas.

This should be a question.

hurrying off to the officer's building searching out their sergeant .

You've got an extra space in between "sergeant" and ".". Would calling it the officer's quarters be more appropriate? That could be my American vernacular there.

The Sergeants office area was a comfortable size for a Seeker of his dimensions.

Should be "Sergeant's" to show possessive tense.

Book shelves nearly lined with books,

Add "were" in between "shelves" and "nearly".