Imperial Marine Sea Force

The Sea Force is a small group of the Imperial Tekkelien Marine Corps that focuses on operations in the littoral, coastal and island areas. Despite being a very small, hyperspecialized unit, they have one of the longest traditions in the history of the marine corps, and are more true to the original mission of marines in general. Sea Force operators, called Divers, often approach targets from underwater and are also tasked with recovery and sensitive salvage operations that may be hundreds of feet beneath the ocean.

Role
Even with the advent of widespread space commerce, much of intraplanetary movement is still done by ocean, being necessarily most cost-effective. As such, coastal installations, ships themselves, and port towns and cities are still considered important military targets. 29th century improvements in resource gathering technology also has led to the rise of numerous underwater and offshore installations.

The Sea Force, being very small, is not intended to mount full-scale invasions and takeovers the way amphibious assaults used to happen, instead focusing on surgical strike missions that require infiltration from the ocean. As all marine special forces are centered around supporting the marine corps' role of securing footholds and spearheading major offensives, the Sea Force typically secures enemy locations that would be a threat to a larger impending invasion such as tracking stations, heavy weapons installations, or enemy command and control posts.

Additionally, the Sea Force is preferred for any mission that takes place at sea or underwater, most of which requires extensive training in close-quarters combat. They are often deployed to respond to hostile takeovers of offshore platforms and ships, and are occasionally sent to perform acts of sabotage against enemy shipping infrastructure themselves. Due to their small numbers, they very rarely respond to issues of maritime law enforcement, however, they have been deployed against pirates when the risk was deemed too high for less experienced units.

Screening
Sea Force candidates are selected during marine basic training, and have the highest standards of physical fitness of any unit. They are screened for mental stability, trustworthiness and the ability to handle a top secret-level security clearance. Their psychological evaluation places an emphasis on handling fears of drowning and claustrophobia. Candidates are put into a confined pod with their biometrics monitored for stress response, a similar process to that of the original astronauts.