Before revision: The joint venture consists of Boeing, the prime contractor for the Space Launch System core stage and the Exploration Upper Stage that will be used on Space Launch System missions and Northrop Grumman, the prime contractor for the Space Launch System's solid rocket boosters.
After revision: ,The joint venture consists of Boeing, the prime contractor for the Space Launch System core stage and the Exploration Upper Stage that will be used on Space Launch System missions and Northrop Grumman, the prime contractor for the Space Launch System's solid rocket boosters.