Navigation and orienteering at night?

Hi everyone,
I read that candidates for the 75th Rangers get tested with some land navigation during night time.

I tried and find information about this but I could not come up with an appropriate field manual or other reference text to use so I am asking:

Do you know where I could find resources and manuals related to night time land navigation? In the selection process, candidates are require to plan their walk in the woods, at night, and reach five check points without using roads or other routes that can give them away to the enemy. They have to keep their helmet light OFF at all times..

..since I know walking in the woods can be very hard at dark..I was wondering where could I get information to the methods and guidelines used for walking and navigating at night..I know about using the stars depending on the hemisphere, using terrain association and/or dead reckoning but.. I could not find anything related to NIGHT walking / marching in the woods etc.

Thanks!