Some UK war movies fall into the "wars really suck" category - an obvious example being The Cruel Sea based on the novel by Nicholas Monsarrat who served in Royal Navy during the Battle of the Atlantic:

"This is a story of the Battle of the Atlantic, the story of the ocean, two ships, and a handful of men. The men are the heroes; the heroines the ships. The only villain is the sea, the cruel sea that man has made more cruel."