The Space Development Agency(SDA) selected three companies to build 18 satellites each for its space-based missile warning, tracking, and defense constellation.The total value of the contract for the supply of 54 satellites is worth $2.5 billion.The satellites will make up a portion of what SDA calls its Tranche 2 Tracking Layer, which will detect and track advanced missiles from low Earth orbit, about 1,200 miles or 1,930 km above the planet’s surface.This step has long term implications.In this video, Defense Updates reports on the US Space Development Agency’s latest contract to buy 54 missile-tracking satellites#defenseupdates #usspaceforce #usmilitary Chapters:00:11 INTRODUCTION01:43 THE CONTRACT03:39 THE PLAN04:22 THE PROGRESS07:49 ANALYSIS