I got the game and being familiar with Arma, I just jumped straight into the editor and started to create a mission. I was happy with the development progress in Arma 3 and how it was acting, but I quickly got stumped. I got stumped on the ability to enter items/objects into the mission. I actually was so stumped that I thought I had to create scripts and tie them to my units to be able to get objects, and proceeded in this manner. By objects, I mean all the guns and whatnot.. Simply put, there was no objects to place in the mission using the editing tool. There was nothing to select, but men.
I now realize what the problem is... It's an oversight of some sort on the design implementation, or <cough> a bug.
If you do not put a player infantry in the mission.. The "SIDE:" selection "Empty" does NOT appear in the editor. So you can never place an object in game until you place a player unit on the map.
As a new user, I found this odd, and definitely wasted a few hours of my time being green to the software... I feel the need to report this and don't quite understand why this "Empty" selection should only occur after playing a player unit in the mission... I do feel its a bug thus why I am reporting this...