The Forever War by Joe Haldeman

I didn't think I would like this novel that much, but I did. Except for the battle scenes (which I found boring) and the sex/sexuality related content (which I found not belonging) I really enjoyed the story. I felt for the protagonist being forced to fight a war he never wanted to fight, for a planet he didn't belong to anymore. 

War was the main theme but I enjoyed how Haldeman explored the ways relativistic speeds would affect humans. How weeks or months would pass for them but centuries would pass outside. Societies could change so much but war was still there every time the troops returned from a mission. 

This novel is about the nonsense of war. About the wasted lives fighting for something they don't understand. About war as a political weapon to control the masses and the economy. Sounds familiar? This novel was written in 1974 but is still relevant in the 21st century. When will humanity learn?