You could in the past destroy Hangers, Guns, And Buildings in the training arena. This may not be a bug but the settings have changed. 100Coogn is right the buildings would just come up quicker than in the MA. This was in the past a great tool in training new players on what it took to take out targets. I hope that in the future that the old settings will return so that I and others can train new and veteran players in the Arena. That feed back was and is crucial in proper training. Please look further into this and let me know if there is any chance this will change.
Thank You For Your Prompt Response.