"We went to visit Camp Pendleton to see the Marines. They’re the most valiant, honorable and courageous men and women in the United States," Heidi and Spencer tell PEOPLE exclusively. "It was one of the best days of our lives."
"Our freedom is so important to us and thanks to these Marines we get to be the entertainers we are. We wanted to take the time to honor them and pay our respects to the Marines who make this country and nation possible and allow us all the freedoms that we enjoy."
The duo spent the day touring the entire base, spent time visiting with the Marines and took meetings.
"We wanted to find out how we can bring the awareness to these true heroes that don't get the recognition and honor they deserve," says the couple.
Montag was so touched, she and Pratt plan to return shortly. She plans to perform her single "Body Language" for 60,000 Marines on the beach at Pendleton on the Fourth of July.
The two even added a new puppy to their brood to commemorate the special day in their lives.
"We named our new member of our family in honor of one the most courageous dedicated humans have ever come in contact with – our pup's name is Sgt. Maj. Kasal," whom they met at Camp Pendleton.