If you're looking for manga similar to Gall Force 4: Rhea Gall Force, you might like these titles.
On October 15th, 1990, World War III breaks out. Earth was cloaked in a nuclear winter lasting for 6 months, and all the grain plants died. Each government fell into anarchy, and transport and communication networks could not be restored easily. Soon, new states were declared by the citizens in various areas. The story is set in 2021, 31 years after World War III. Filicia Epstein, a bionics genius, came to Sabano and Sergent Mutou was ordered to protect her. Searching for her only brother, Lyon, Filicia encountered 1019, a cybernoid, who directed them to the phantom city, OZ, a shelter created by Lyon. As the story unfolds, they gradually realised what 'OZ' actually was...
How do you define "human"? That is a question that Gally has to answer for herself after she awakens in the sky city of Salem. When she learns that her former enemy Dr. Desty Nova has rebuilt and perfected her body, Gally seeks to find her friend Lou and re-access her own lost memories. But she is confronted with a tragic incident: Desty has revealed the Secret of Salem. At the age of 19, the people of Salem have their brains removed and replaced with computer chips. Learning this, the citizens go mad and begin to riot or commit suicide. Amidst the carnage around her and ghosts from her past, can Gally truly come to terms with herself?
After facing massive destruction from a devastating war, the city Olympus has become the last stronghold as the center of command for the world. In order to protect the city from a group of terrorists known as the Argonauts, former LAPD SWAT member, Deunan Knotts, runs special military forces consisting of Biroids (cloned humans) and her cyborg partner Briareos. Knotts must protect the city at all costs but is met with difficulties when Al Ceides, the Argonaut leader thought to be dead, resurfaces and causes problems.
Cyborg 009 Conclusion - God's War is intended to be a proper conclusion to the original Cyborg 009 series.
Ten years ago, artificial biological implants known as "augmentation parts" were introduced into society. At the time, no one suspected the sinister turn of events that would come about because of body augmentations. And as the politicians and police stood by, the world watched as cyborg criminals, otherwise known as "augs," turned the world on its head...