May is Military Appreciation Month, and Activision is marking the occasion with new DLC for Call of Duty games that supports the company's veteran-themed charity, the Call of Duty Endowment. Additionally, Activision has announced it received the biggest-ever private donation to the endowment to the tune of $2.5 million.

Kenneth C. Griffin, the founder and CEO of the hedge fund Citadel and founder of Griffin Catalyst, has donated $2.5 million to the charity. This amount will help support the placement of more than 4,000 veterans in new jobs, Activision said.

The new DLC out now is the Call of Duty Endowment Knight Recon Tracer Pack for Modern Warfare III, Warzone, and Warzone Mobile, along with the Regulator pack for Call of Duty: Mobile.