The 50-year-old Oscar winner braved pouring rain to attend the event at The Tank Museum in Bovington in Dorset.
Pitt wore dark sunglasses as he entered the site to promote Second World War film Fury, in which he plays a battle-hardened army sergeant.
He removed his shades and posed for pictures beside Logan Lerman, Jon Bernthal, and David Ayer, the writer, director, and producer of the film.
The photocall came days after Pitt wed Angelina Jolie at the Chateau Miraval in France in the presence of their six children.
Pitt was photographed wearing a gold ring on his wedding finger during the museum event.
Fury, set in 1945, also stars Shia LaBeouf and Michael Pena as part of an American crew embarking on a deadly mission behind enemy lines.
Pitt plays army sergeant Wardaddy, who commands a Sherman tank and a five-man crew on the assignment.
Wardaddy and his men are outnumbered and outgunned and face overwhelming odds in their heroic attempts to strike Nazi Germany when a rookie soldier is thrust into their platoon.
The film will be released nationwide on October 24.
Jolie and Pitt met on the set of their 2005 thriller Mr & Mrs Smith, in which they played married assassins who are hired to kill each other.
At the time, Pitt was married to actress Jennifer Aniston, but has always denied allegations of cheating.
Pitt and Jolie became parents to adopted children Maddox and Zahara before the birth of their first biological child, Shiloh, in 2006.
Pitt was in the operating theatre and on hand to cut the umbilical cord as Shiloh was born by caesarian section in Namibia.
The following year, the Tomb Raider star and Fight Club heart-throb adopted son Pax, then aged three, from Vietnam.
In 2008, their second and third biological children, twins Vivienne and Knox, were born at a hospital in Nice, France.
Last year, the couple spoke of their close relationship after Jolie, who won an Oscar for best supporting actress in Girl, Interrupted, announced in a New York Times article that she had had a preventative double mastectomy.
Pitt described Jolie’s decision, made because she carried the ‘faulty’ gene BRCA1 which sharply increases her risk of developing breast and ovarian cancer, as “absolutely heroic”.
In the article, Jolie wrote: “I am fortunate to have a partner, Brad Pitt, who is so loving and supportive. So to anyone who has a wife or girlfriend going through this, know that you are a very important part of the transition.
“Brad was at the Pink Lotus Breast Centre, where I was treated, for every minute of the surgeries.”