Shinji (OFF):“Do you usually do this sort of thing?”
Kensuke (OFF):“Huh? Well, sure.”
Shinji (OFF):“Is this training for guerilla warfare?”
Kensuke (OFF):“What could I do with toys like these? It's just for fun.”
Fade-out.
Treize X: I'm curious, why does Shinji actually think Kensuke is guerilla training? Because of the fatigues and the apparent realism of the gun ?
Otaprince: It's worth explaining that Kensuke is not simply "playing soldier" as most boys do, but that Japan has a certain type of otaku who are totally into uniforms and gun replicas: military otaku. I suspect that a number of Gainax creators have been some shade of military otaku, including Anno, who seems to be very interested in submarines and WW II-era naval ships in particular. Military otaku are satirized, along with other otaku types, in Gainax's earlier work, Otaku no Video.
Shinji is probably confused because, even in Japan, military otaku are a rare breed.
OMF: He probably doesn't understand regular playing soldiers. He's more into cooking, cleaning, writing, sewing…