As the "OH-58" tag has been added, removed then added again, I'll chime in. I removed it again as the helicopter over Kaname's head in the "napalm" panel is a MD 500 variant, with the type's distinctive tail. This is also an error on the artist's part, as the Vietnam conflict predates the type. The original OH-6 'Loach' that the MD 500s would be derived from were in service during the war, and a quick check of the original movie confirms that OH-6s were used in the filming. Possibly drawn as such due to the Japanese military's use of the MD 500 derived version.
Homulard: "Everyone gets everything they want. I wanted a contract, and for my sins, they gave me one. Brought it up to me like room service. It was a real choice contract, and when it was over, I never wanted another."