He smiles. "I said 'nightmare,' Captain, not 'impossible.'"

Chekov had to grow up someday. He'd been a little young and naive when he'd enrolled in Starfleet. Given the history of the known universe, expecting nothing but peaceful exploration and discovery was childish. Then again, he had been a child. But not anymore. Not since the moment the Enterprise flew into the field of debris. Dead friends, dead comrades. Yes, he grew up quickly, but now he's more prepared for what's really out there.

"The city does not look like it is at war. What exactly does he expect us to fight?"

Chekov is incredibly unimpressed. Take him away from the Enterprise to fight a war? He was tired of war.