The NSA was under new management and they offered Oliver a job as an agent. They needed him to go undercover and infiltrate the Eden Corps , an extremist eco-terrorist organization.  On his first mission with them he was forced to fight his closest friends and allies; gaining their confidence he also started a romantic relationship with their leader Hyrax .  He fought off Connor, Eddie Fyers, Arsenal and even the Force of July . Hyrax had a bomb named the Mutajek 9-9 and planned to destroy Metropolis with it.  On the plane ride there was a massive fire fight with another deep-cover agent, and most of the terrorists were killed. Green Arrow's arm was inside the detonation chamber for the bomb, which would activate if he released his hand. Superman tried to help but had no way of saving him other than tearing off his arm.  Rather than allow himself to be crippled Queen let the plane explode, sacrificing himself to save thousands of people. Having been completely vaporized in the blast, there was no body. A small funeral gathering of his closest friends was held in Warriors . There was nothing to bury, so his son fired an arrow into the air and marked its landing as his final resting place, as in the legend of Robin Hood . Connor Hawke then decided to continue on his legacy. 
One point that is commonly brought up in the discussion of space warfare is the three-dimensional nature of space, and the need to think in three dimensions. While this is technically true, it is probably not as big of a factor as it is often portrayed to be. First, efficient transfers will be in the ecliptic plane, which means that most of the deployments will be made in that plane, in two dimensions. Even if one side chooses an inefficient transfer to avoid this, they would have to split up their force on the way to achieve meaningful separation between its elements, throwing away any advantage of surprise it might give them. Second, ships will be generally unable to maneuver in combat (as described above), limiting the impact of any brilliant 3-D tactics, as the opponent will have plenty of time to respond. Third, humans have been fighting in a 3-D environment for almost a century, and with a little bit of training, most people do not seem to have a problem thinking in 3-D. All but the most inexperienced officers will be familiar with the fact that space is not 2-D, and react accordingly.