The PIONEER is a Codex featured in Tom Clancy's Rainbow Six Extraction. It is unlocked by default.
Transcript[]

The PIONEER is REACT's base of operations and mobile research center. Currently deployed to study the Chimera threat.
The modified freighter is refitted as a fully self-sufficient scientific expeditionary platform. Currently staffed by 1273 personnel from 134 countries (Max. Capacity - 1500+). (INSERT: Hibana - It's our own floating town. Maho loves the daycare.)
Internal conversion added facilities dedicated to maior scientific, engineering and technological fields. Includes only BSL-6+ rated biocontainment laboratory in the world (access level Crimson).
Planned Upgrades:
Ongoing enhancements include enclosed environmental control system (LSS), structural reconfiguration and propulsion system conversion. Suggests future deployment to areas of contaminated or non-existent atmosphere. (INSERT: Pulse - Non-existent atmosphere?! Eliza, just what are we talking about here? @Ash)
Additional quarters and infrastructure facilities have been proposed. REACT psychologists have enacted a pilot project to accommodate family units aboard the PIONEER. Preliminary studies underway for implications on future extended missions. Outlook: Promising. (INSERT: Hibana - We can't wait for the daycare to open and have Maho close... AND so many babysitters!)
PIONEER is the first in a planned fleet of deployable research stations. (Query: flagship)