The purpose of Wood Badge is to develop skilled leaders who can strengthen Scouting units in achieving the mission of the Boy Scouts of America.

When we accomplish the mission of Scouting, we do it in the units. Therefore, the short form of the purpose is, the purpose of Wood Badge is to strengthen units.

Although the course is different today, what Baden-Powell said in 1919 still applies:

One of the purposes of Wood Badge training is to get Scouters to think about the practice of Scouting, to meet together, to exchange experiences, and to live together in the spirit of the Scout Oath.