Thunder Blade: A 1987 Sega release.

Your job is to shoot down all the bad guys in your state-of-the-art helicopter gunship  You are supplied with an infinite supply of machine gun bullets and air-to-ground missiles with which to take out the array of enemy military vehicles lying in wait.Thunder Blade has a unique gameplay mix. Each of the four stages is split into three parts - a top-down vertically scrolling shooter, followed by some flying into-the-screen and then finally a boss battle. All three sections merge together seamlessly; the in-game camera dynamically adjusts the viewpoint as required. It's this sporadic mix that gives Thunder Blade its unique charm.