ill be honest with you earth and valiant doesnt go together very well.
the skill matrix that reports for free on the headquarters is too identical and you rather want more cadets.
Its also problematic that you have 2 forced seed spots and they might be far away from each other.
Also cant report Mission Specialists to Earth (with Assign Mission Specialists
I also tried the Valiant Earth combo at first (came back last year), but I recommend using Type 18 Shuttlepod
drops to the Valiant + free report of cadets. That gives you tons of interesting personnel (with Navigation) and they ignore quad restrictions. So bring all the big Deltaguys and Mirrors.
Then you can reconsider the mission choice.
With the right MS its also easy to pull a 2 mission win.
Disclaimer: All thats written^, is just my opinion. Its true for me and not meant to upset. If you disagree, you are not wrong. If the tone is too harsh, feel free to rephrase it to: "Hey guys, i have exp X, Id like you to agree with idea Y"