Would appreciate it if someone could tell me what the kanji after サバイバル (down right)　and 乳 (at the button) are supposed to be. Not sure the translation is entirely correct.

The compound after サバイバル is probably 訓練 (くんれん).
As for the compound next to the button, the ヴァルキュリア written above it is likely meant to be the reading for that compound.
The kanji would then simply be 当て字 which point out how Valkyria descendents have large breasts, though with the exception of Valkyria 2's Aliasse.
It's possible the second kanji is meant to be read さ to fit with 大佐 (Colonel, Selvaria's rank) as it bears some resemblance to 左, 佐, and 差.

I'm fairly sure that it is 乳圧 (breast pressure).