Orion ECLSS a "tall pole"?

[ChileVerde]

Does anybody here have any insight into what Mr. Hill was talking about at the HEOC meeting? Is there any particular problem with the life support system?

http://www.nasa.gov/pdf/675947main_HEOC%20Minutes%20July%202012-508.pdf

National Aeronautics and Space Administration
Washington, DC
NASA ADVISORY COUNCIL
Human Exploration and Operations Committee
July 23-24, 2012 Goddard Space Flight Center Greenbelt, MD
MEETING MINUTES

In response to a question from Mr. Malow, Mr. Hill indicated that the 2017 mission is included in the out-year profile; however, the 2021 mission is not in the profile yet because NASA is assuming flat-funding. The “tall pole” for Orion is the ECLSS, and the 2017 mission will have some of that.