In 2008, the U.S. Supreme Court sided with the Boy Scouts of America of America and ruled 5-4 that the organization is exempt from state laws that bar anti-gay discrimination.
The court overturned a ruling by the New Jersey Supreme Court to require a troop to readmit a longtime gay scoutmaster who had been dismissed.
The Girl Scouts of America has had a diversity policy and non-discrimination clause since 1980.
Since 2011, Wahls has become a national figure, after he spoke at a public forum on House Joint Resolution 6 in the Iowa House of Representatives in 2011.
He dropped out of the University of Iowa to do advocacy work and is the author of "My Two Moms: Lessons in Love, Strength and What Makes a Family."
Last April, he supported a petition to reinstate Jennifer Tyrrell, an Ohio mother of four who was fired as leader of her 7-year-old's Cub Scout pack because she was a lesbian.
At the time, Tyrrell, 32, told ABCNews.com that she had removed her 7-year-old son Cruz from the troop because of its discrimination against gay leaders and scouts.
She had been told by her community leaders that her sexual orientation "did not meet the high standards" of conduct set by the Boy Scouts of America.
"We can no longer support an organization that has these policies and we hope to get them changed. That is our main goal," said Tyrrell, who lives with her partner of five years. Ohio does not recognize gay marriage.
Tyrrell's case garnered the endorsement of celebrities such as "Hunger Games" star Josh Hutcherson and Jesse Tyler Ferguson from television's "Modern Family" and Max Adler and Dianna Agron from "Glee."