Camping. A Boy Scout or Varsity Scout may earn the National Outdoor Badge for Camping upon successfully completing the following requirements:

1. Earn the First Class rank.
2. Earn the Camping merit badge.
3. Earn two of the following three merit badges: Cooking, First Aid, Pioneering.
4. Complete 25 days and nights of camping—including six consecutive days (five nights) of resident camping, approved and under the auspices and standards of the Boy Scouts of America—including nights camped as part of requirements 1 through 3 above.

A gold device may be earned for each additional 25 nights of camping. A silver device is earned for each additional 100 nights of camping. The Scout may wear any combination of devices totaling his current number of nights camping.

For other segment requirements 

    http://www.scouting.org/scoutsource/boyscouts/youth/awards/noa.aspx