The 40th anniversary of Charlie Daniels' Volunteer Jam just even bigger. Country legends Alabama have announced that they are joining the show's lineup, which already boasts more than a dozen acts.

Along with Alabama, already-announced acts for the event include Lee Greenwood, Montgomery GentryTravis Tritt, the Grascals, Phil Vassar, Billy Ray Cyrus, Colt Ford, the Kentucky Headhunters, Tracy Lawrence, Craig Morgan, Michael W. Smith, the Oak Ridge Boys, the Outlaws and Lee Roy Parnell.

Proceeds from the Volunteer Jam will go to the Journey Home Project, a non-profit that helps raise money for causes that benefit veterans of the United States Armed Forces -- an organization that Daniels is proud to support.

“I hope to see more Nashville Volunteer Jams in the future,” Daniels says. “I’m very, very excited to continue the Jam tradition 40 years later. Ain’t it good to be alive and be in Tennessee.”

Rising country star Ryan Weaver, a former active duty Black Hawk helicopter pilot and Chief Warrant Officer 3, will also share his own personal stories of the losses of both his brother and brother-in-law.

"After I lost my brother Aaron, who was tragically killed in combat by enemy fire, I realized that I was letting my dreams pass me idly by, and although it is unfortunate that it took a sacrifice and a loss like that to make me see that, it really pushed me to chase my dream," Weaver explains. "His sacrifice, and my brother-in-law Randy's sacrifice in 2013, have fueled my fire to achieve success in this amazing business."

The 40th anniversary Volunteer Jam will be held on Aug. 12 at Nashville's Bridgestone Arena. More information, including ticketing details, is available on the Journey Home Project's website.