As for Chemical Weapons...
Sending ships from Earth to another star system would be very expensive and even with the best technology it is likely a better idea to manufacture as much as possible there than to bring it all with you.
Robotic ships first arriving, processing raw materials into simple modular facilities, creating vehicles and weapons which use the abundant chemicals and materials present on the planet.
Years later humans eventually arrive and begin to destroy the rest of the planet.
The phone company wants Congress to make RJ11 jacks mandatory on all cell phones too.
Talk with your crew you are going to support.
Gather up the apps and OSs they presently using.
Choose an OS that supports their apps.
You should be as self reliant as your budget can allow.
Make sure equipment can do all tasks, even if one is more optimized for it. If something goes down another machine on hand can be used. If possible make them exactly the same and carry an extra cloned drive. Carry an extra of common items most likely to beak, be stolen or left behind. Have a plan in place for a catastrophic failure or theft of equipment and have a process in place to be able to quickly ship a replacement while you make due. Never assume anything can be obtained locally, and even if it can, if you can carry on for while, often shipping is better and you get exactly what you need. Backup like crazy and have multiple crew carry a copy and never ever store it with the equipment.
Good luck and have fun!
I have a theory that it's impossible to prove anything, but I can't prove it.