Find as many sentries as you can in 24 hours.
"Those army checkpoints are a bit of a nightmare. They're on the look-out for the terrorists who blew up inverness station, and you're the number-one suspect. Better scout around to see if you can find a safe place to get past all those sentries then."
- That sentry hasn't got his eyes on the job - they're too busy checking out the pretty corporal on the next checkpoint.
- Well, you could try rushing past the soldiers on that abandoned scooter. Probably not a great idea, though.