This is the chain of command. It must be obeyed. Defying a direct rder from a superior officer can and likely will result in a court marshal.

These are the Officer Ranks.

Army Ranking
General->Lieutenant General->Major General->Brigadier General->
Colonel->Lieutenant Colonel->Major->Captain->Lieutenant->2nd Lieutenant

Navy Ranking
Admiral->Vice Admiral->Rear Admiral->Read Admiral 2nd Class->
Captain->Commander->Lieutenant Commander->Lieutenant->
Lieutenant Junior Grade->Ensign

Airforce Ranking
Same as Army