The Other Suppression Force (OSF) is a group of elite soldiers hired to defend Earth from the Others, Members of the OSF are required to take "Anti-Aging Drugs" (A conversation between Kyoka Eden and Naomi Randall can be found in the menu regarding AAD's) to keep them young and stronger.
Anyone who has caught the interest of the OSF council (Described as being "scouted" by them) must take these drugs effective immediate.
Anyone who is currenly a member of the OSF must take these drugs on a daily basis.
All OSF members have a special ability that helps them defend Earth or each other.
The OSF is divided between two regiments which themselves are divided into companies and then into Platoons.