Related Clues:

• It may be triggered by a decloaking warbird
• Emergency warning
• "Warning!"
• High state of preparedness
• Period before a big deadline
• [Urgent! Urgent!]
• When to pull an all-nighter
• Do-or-die moment, or what you must do to this puzzle’s theme answers
• "Danger! Danger!"
• *When to pull an all-nighter