this section is called "Phrases". That's misleading.
I thought these were actually normal Vietnamese phrases on my first few run-throughs.
Duolingo, don't call this section phrases if these aren't phrases that people actually say. Orrrrrr, fill this section with real phrases that people actually use in some parts of Vietnam.
Jet pilot to copilot to disperse those metal bits to evade radar. Window is the military code word for them.