Well, the pose in panel 1 is from a commando thing I believe; as well as the "what is starting?" [or something, don't remember the exact line] "the third world war".
SFX From Commando. One can assume that this is a play on Commando (コマンドー) and Commandant, given that Ido has made jokes on Commando before.World War 3.Newbie-san!
Merry welcome to you!Commandant TesteAnother weirdo came.That outfit...What are you expecting?