Final answer:
Military airports at night can often be identified by unique lighting patterns, specialized navigational aids, or restricted airspace, rather than the simple presence of military signs like vehicles or personnel.
Step-by-step explanation:
Identifying a military airport at night involves observing distinct features not typically found at civilian airports. Although the question seems to point towards visible signs like aircraft, personnel, vehicles, and equipment, these might not always be discernible or specific enough at night. Instead, military airports may be recognized by unique patterns of lighting, specialized navigational aids, possible restricted airspace marked on aviation charts, or even the lack of typical commercial airport characteristics such as terminal lights and advertising. It's important to note that unless one has specific knowledge or clearance, identifying a military airport at night, especially from a distance, might be challenging.