As might be imagined given that Greenhill spent most of his life working in a military establishment, his work was often directed towards applications to ballistics and other military applications.
Bilang ay maaaring imagined given na Greenhill nagastos karamihan ng kanyang buhay sa pagtratrabaho sa pagtatayo ng isang militar, sa kanyang trabaho ay madalas Directed patungo sa mga aplikasyon sa ballistics militar at iba pang mga application.