Selected Financial Data by Business Segment (continued) (a) Operating profit included equity in net earnings (losses) of equity investees as follows: (b) Severance and other charges include the severance charges recorded in 2011 associated with Aeronautics, IS&GS, and Space Systems business segments, and Corporate Headquarters, and for 2010, included the charges related to the VESP and facilities consolidation within Electronic Systems (Note 2). (c) Other unallocated corporate expense, net included the following: (In millions) 2011 2010 2009 Aeronautics $7 $7 $9 Electronic Systems 64 50 53 Space Systems 227 259 218 Total business segments 298 316 280 Corporate activities 34 (4) (2) Total $332 $312 $278 (In millions) 2011 2010 2009 Non-cash FAS/CAS pension adjustment $ (922) $(454) $(456) Stock-based compensation and other, net (243) (305) (233) Total $(1,165) $(759) $(689) Net Sales by Customer Category (In millions) 2011 2010 2009 U.S. Government Aeronautics $10,749 $10,623 $ 9,966 Electronic Systems 10,662 10,749 9,864 Information Systems & Global Solutions 8,769 9,488 9,156 Space Systems 7,821 8,000 8,401 Total $38,001 $38,860 $37,387 International (a) Aeronautics $ 3,577 $ 2,458 $ 1,973 Electronic Systems 3,883 3,562 3,664 Information Systems & Global Solutions 464 320 267 Space Systems 144 97 241 Total $ 8,068 $ 6,437 $ 6,145 U.S. Commercial and Other Aeronautics $ 36 $ 28 $ 49 Electronic Systems 77 88 102 Information Systems & Global Solutions 148 113 176 Space Systems 169 145 8 Total $ 430 $ 374 $ 335 Total net sales $46,499 $45,671 $43,867 (a) Sales made to foreign governments through the U.S. Government (i.e., foreign military sales) are included in the “International” category. Our Aeronautics business segment includes our largest program, the F-35 Lightning II Joint Strike Fighter, an international multi-role, stealth fighter. F-35 program related net sales represented approximately 13%, 12%, and 10% of our total net sales during 2011, 2010, and 2009. 63