"Thirty seconds to drop," Captain Vane crackled over the comms. He checked his sidearm, the matte black finish of his PKF-issued gear absorbing the dim red light of the hold. "The insurgent cell has barricaded the lower vaults. Command wants a clean sweep. No survivors, no data leaks."
: The use of punctuation can depend on the style guide you're following (e.g., AP, MLA, Chicago). For titles, it's common to capitalize and punctuate as you would a sentence.
: Specific features that set it apart from other military-themed titles. "Thirty seconds to drop," Captain Vane crackled over