History: after bringing the AC Earth under their control the red tide purged all corruption and those corrupt in the corporations were executed  while those that werent were ordered to follow the red tide and do not disobeyed 

to ease the transition between both sides 

the corporations would lend their lynx pilots to the red tide 

and would show them the designs of the various normals units Armored Core Next and the most infamous the arms forts 

when the arms forts plans were show the air force and navy found no Intrested in them 

while the space force already had a powerful navy 

the army on the other hand needed  a edge to break heavily defended areas from the remnants of the specters 

so they commissioned GA and BFF  to develop the land crab and Spirit of Motherwill 

when the arms forts flaws were solved they were deployed and eliminated the specters ruthlessly 

the army ordered for the land crabs and motherwill to serve as mobile HQ AND fire bases 

and were useful to the point 

the air force and navy needed their own arms 

forts they contacted interior union and Omer science and technology to develop their own arms forts 

the Interior union supplied the Stigro with its powerful frontal blades and missiles and torpedoes it was used 

in eradicating any remnants of the anti red tide league formed by defeated nations of several watery worlds that attacked the red tide scientist that were researching several crashed ships and ruins 

the air force got the eclipse and once it was used they eradicated 

a large number of legion drone units from another universe where they won the war against the nations of earth and space 

the red tide destroyed them ruthlessly 

with the army and navy with the help of GA developed the giga base a mobile landship capable of operating at sea 

and at land is useful in providing long range bombardment with its cannons 

and with the destruction of the copy cat of Motherwill the legion used  the allied forces on earth and especially the red tide are planning to deploy their arms forts to push into the mainland of China and end the legion once and for all