Later in the article: "Only about 50,000 units have been sold so far, according to a recent Microsoft video. By contrast, the US Army might buy as many as 100,000 headsets, essentially tripling sales."
"Microsoft's Hololens has already been used by a number of armies for training, but it's about to go to another level. The US Army has awarded Microsoft a $480 million contract to supply the headset for live combat missions as well as training, according to Bloomberg. The aim, according to a government description, is to "increase lethality by enhancing the ability to detect, decide and engage before the enemy."US Army to use Microsoft’s Hololens for combat missions | Engadget
The US Army encouraged non-traditional military suppliers like Microsoft, Magic Leap and others to bid on the contract. It wanted a device that could allow for night vision, the ability to measure breathing and other vital signs, offer hearing protection and monitor for signs of concussion. It's not clear yet how Microsoft will bring those capabilities to Hololens."