As announced by Funimation, Full Metal Panic! light novel author Shoji Gatoh and illustrator Shikidouji at this year's Anime Expo, the new anime Full Metal Panic! Returns to our screens in spring 2018. The series will be titled Full Metal Panic! Invisible Victory, while the first promotional video was also shown during the event. The video presented the protagonists Kurama and Amalgam soldier Lee Fowler from the novel, while Mao will be promoted to Lieutenant with a new uniform and several new mecha. 

The anime was originally slated to premiere this fall, but it was removed from the list earlier this year.

Katsuichi Nakayama is assigned to the direction of the series in XEBEC studio, while the author of the original novel, Shoji Gatoh, is handling the series composition and writing all the scripts. Osamu Horiuchi (Full Metal Panic!, Full Metal Panic! The Second Raid) is designing the characters, serving as the chief animation director. Kanetake Ebikawa and Toshiaki Ihara are the mechanical designers and finally, Masanori Nishii is the mechanical director.

The original novel series Full Metal Panic! debuted in 1998 with the 12th and final volume to have been released in 2010. The story inspired the first 24-episode anime series in 2002, followed by Full Metal Panic? Fumoffu in 2003 with 12 episodes. In 2005 the third 13-episode anime series was released, entitled Full Metal Panic! The Second Raid. Moreover, several spin-off manga and other novels are based on the original novel, one of which is Full Metal Panic! Another that was released in 2011 and was completed in February 2015.

Source: animenewsnetwork.com