Before revision: In 2004, the United States Navy began fitting photonics masts to s. How Photonics Masts Will Work According to the US Navy: In Virginia-class boats, traditional periscopes have been supplanted by two Photonics Masts that house color, high-resolution black and white, and infrared digital cameras atop telescoping arms.
After revision: In 2004, the United States Navy began fitting photonics masts to s. According to the US Navy: In Virginia-class boats, traditional periscopes have been supplanted by two Photonics Masts that house color, high-resolution black and white, and infrared digital cameras atop telescoping arms.