This emblem is NASA's second official insignia. It is now also the official, having replaced the NASA worm design. It is nearly identical to the NASA Original that was used during all the Mercury flights, but as early as the Gemini 3 mission a slight design change was made. The red winged vector was extended beyond the circular border of the NASA Original and the size was increased from 2.5 inches in diameter to three inches. The emblem is unofficially known as the NASA "Vector".