If you're looking for manga similar to Full Metal Panic! Invisible Victory - Intermission, you might like these titles.
Years after a great war was waged between the portion of humanity that migrated to Mars and those who chose to remain on Earth, a tentative peace has been struck. But not everyone is happy with the status quo. When the Princess Asseylum of Mars makes a diplomatic visit to Earth in an effort to strengthen ties, some see it as an opportunity to reignite the flames of war. Can the citizens of Earth stand against the awesome might of the Martian Kataphrakts a second time?
This is another story in the Full Metal Panic universe, set some years after the events with Sousuke and Kaname. Ichinose Tatsuya is a pretty normal high school boy, who lives with his father and little sister Yukari. He has a tendency to fall in love with foreign women, which has never turned out well for him. One day, while up in the mountains driving a Power Slave to help out with his father's company, he runs into yet another beautiful foreign woman, called Adelina. He lends her a hand and is surprised to see that she has a military Arm Slave, called "Shadow," with her. What is this mysterious and highly armed woman doing up in the mountains? Tatsuya's life is about to get a lot more exciting...
The manga will begin with an original story that depicts the blank period leading up to the resurrection.
A three-man team of Martian-based Coordinators led by Agnes Brahe commands the Acidalium. The trio gets involved in the second EA-ZAFT War as Agnes controls the Voiture Lumiere-based mobile suit known as the GSF-YAM01 Δ Astray.
In A.S. 106, Five years after the "Vanadis Incident" which denied all Gundams, those cursed Mobile Suits are now roaming the earth.
When an unknown Arm Slave surfaces somewhere in the Taiwan Strait near mainland China, MITHRIL orders Melissa Mao and her team to go into a divided Hong Kong to investigate the perpetrator of the unknown Arm Slave. As the team continues to check into the reports of the unknown Arm Slave, the culprit is believed to be a potential SRT recruit back from Sousuke's training days in Belize when he was not recruited by MITHRIL.
Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her!
Universal Century 0096. Three years after the last conflict between Neo Zeon and the Earth Federation Forces, the tentative peace of the Earth Sphere is about to be shattered again. Cardeas Vist, the head of the powerful Vist Foundation, has decided to hand over "Laplace's Box," the secret of the Foundation's prosperity, to the supposed enemy, Neo Zeon. Banagher Links, a student at the space colony Industrial 7, rescues a mysterious girl who calls herself Audrey Burne. Audrey is seeking to prevent a war, but it seems she has come too late. As Banagher's home colony is devastated by the attacks of the enemy mobile suit Kshatriya, he finds his strange destiny and is forced to fight in the formidable weapon system known as the Unicorn Gundam.