Bacura

The Bacura are an unknown force that has been spotted over Tokyo airspace. They appear as spinning rectangles floating in mid-air at very high altitudes. Most ordnance does nothing to the Bacura; only cannons mounted onto aircraft are confirmed to damage them.

The origin of the Bacura is entirely unknown.

Trivia

 * The Bacura - rectangles that constantly flip towards the player - were first featured in Xevious, an Atari arcade game developed by Nintendo and Bandai. Later games in the series featured different types of Bacura, including some that would flip in the opposite direction as well as others equipped with turrets. They also appeared in Tales of Symphonia.
 * The Bacura were discovered in Ace Combat Infinity during mid-June of 2014. They rarely appeared as the Mission Update during Tokyo Martial Law, during which the background music of Xevious would play. All missile-type weapons phase through the Bacura and do no damage to them, while cannon fire manages to hit them.
 * This may be a reference to the fact that the Solvalou - the player's ship in Xevious - could only fire cannons and bombs, where the cannons would damage air targets and the bombs would damage ground targets. However, in Xevious, the Bacura cannot be damaged and must be avoided.
 * It has not yet been confirmed if any of the Bacura can be destroyed.