Bringing a military item (e.g., toy, picture, t-shirt, etc.) is encouraged for Show-and-Tell, but not required.

学習者は、Outschoolが提供する基本ツール以外のアプリやウェブサイトを使用する必要はありません。

Each book discusses the types of weapons that the military vehicle is equipped with including machine guns, missiles, etc.  All is discussed in an age-appropriate context for how the US military (Army, Navy, Air Force, Marines) use these types of weapons on vehicles to protect citizens against enemies.  The focus of each book is not on the weapons, but the vehicles themselves, the purposes of the vehicles, how they move around, speed, shape, number of crew members, etc.