Re:Swiss Army Pen (Score 1)

Simple really, in a combat environment, you might need to use a vehicle whose keys you wouldn't have. Thus, military vehicles are push button start, no key needed. Combat vehicles I've seen are designed so all doors can be locked from the inside, (prevents the bad guys from sneaking up and pitching in a grenade). While one can be padlocked from the outside to secure the vehicle while in the motor pool. Non-combat vehicles like trucks don't even have locking doors. In the motor pool, they a secured with a chain padlocked onto the steering wheel. You could get in and start it, but it'd be hard to drive it away.