Forty-three percent of active duty service members have children. http://cs.mhf.dod.mil/content/dav/mhf/QOL-Library/Project%20Documents/MilitaryHOMEFRONT/Reports/2007%20Demographics.pdf
Many of these children have to deal with parents that return from war acting totally different from when they left. Vary young children may exhibit separation anxiety, temper tantrums and changing in eating habits.
However, I believe it is far worse for the Iraqi children. Up to 95% of all pregnant women in Iraq suffer from anemia and in turn will deliver weak, malnourished babies. Most of these infants will either die before reaching age five due to lack of food and basic medicine, or will be permanently scared, either mentally or physically http://www.armymedicine.army.mil/reports/mhat/mhat_v/Redacted1-MHATV-OIF-4-FEB-2008Report.pdf