[Question] Operation Center terminal puzzle answer?

Hi

Only just started out playing the game (on PC) and found one of these. I had absolutely no clue what to do so I guessed 'Drop pod' and got it wrong. My question is how should I have known what to enter, and can I try again (it's not currently letting me try and re-attempt the puzzle)? I searched online for this and couldn't find anything, so hopefully someone can help me here.

Thanks :)