reporting unit 2019s related goodwill assets . in 2013 , we recorded a non-cash goodwill impairment charge of $ 195 million , net of state tax benefits . see 201ccritical accounting policies - goodwill 201d in management 2019s discussion and analysis of financial condition and results of operations and 201cnote 1 2013 significant accounting policies 201d for more information on this impairment charge . changes in u.s . or foreign tax laws , including possibly with retroactive effect , and audits by tax authorities could result in unanticipated increases in our tax expense and affect profitability and cash flows . for example , proposals to lower the u.s . corporate income tax rate would require us to reduce our net deferred tax assets upon enactment of the related tax legislation , with a corresponding material , one-time increase to income tax expense , but our income tax expense and payments would be materially reduced in subsequent years . actual financial results could differ from our judgments and estimates . refer to 201ccritical accounting policies 201d in management 2019s discussion and analysis of financial condition and results of operations , and 201cnote 1 2013 significant accounting policies 201d of our consolidated financial statements for a complete discussion of our significant accounting policies and use of estimates . item 1b . unresolved staff comments . item 2 . properties . at december 31 , 2013 , we owned or leased building space ( including offices , manufacturing plants , warehouses , service centers , laboratories , and other facilities ) at 518 locations primarily in the u.s . additionally , we manage or occupy various u.s . government-owned facilities under lease and other arrangements . at december 31 , 2013 , we had significant operations in the following locations : 2022 aeronautics 2013 palmdale , california ; marietta , georgia ; greenville , south carolina ; fort worth and san antonio , texas ; and montreal , canada . 2022 information systems & global solutions 2013 goodyear , arizona ; sunnyvale , california ; colorado springs and denver , colorado ; gaithersburg and rockville , maryland ; valley forge , pennsylvania ; and houston , texas . 2022 missiles and fire control 2013 camden , arkansas ; orlando , florida ; lexington , kentucky ; and grand prairie , texas . 2022 mission systems and training 2013 orlando , florida ; baltimore , maryland ; moorestown/mt . laurel , new jersey ; owego and syracuse , new york ; akron , ohio ; and manassas , virginia . 2022 space systems 2013 huntsville , alabama ; sunnyvale , california ; denver , colorado ; albuquerque , new mexico ; and newtown , pennsylvania . 2022 corporate activities 2013 lakeland , florida and bethesda , maryland . in november 2013 , we committed to a plan to vacate our leased facilities in goodyear , arizona and akron , ohio , and close our owned facility in newtown , pennsylvania and certain owned buildings at our sunnyvale , california facility . we expect these closures , which include approximately 2.5 million square feet of facility space , will be substantially complete by the middle of 2015 . for information regarding these matters , see 201cnote 2 2013 restructuring charges 201d of our consolidated financial statements . the following is a summary of our square feet of floor space by business segment at december 31 , 2013 , inclusive of the facilities that we plan to vacate as mentioned above ( in millions ) : owned leased u.s . government- owned total .
what percentage of total square feet of floor space by business segment at december 31 , 2013 is in aeronautics?
we believe our facilities are in good condition and adequate for their current use . we may improve , replace , or reduce facilities as considered appropriate to meet the needs of our operations. .