war word donald trump parent muslim u.s. soldier kill iraq 2004 dominate election campaign khizr ghazala khan criticize republican presidential candidate appear democratic national convention last thursday share story son u.s. army captain humayun khan khans know unite state gold star family mean lose immediate relative military action gold star refer centerpiece flag give families monday 20 gold star families write trump condemn treatment couple say cheapen sacrifice soldier die demand apologize khans follow facts gold star families gold star families gold star families lose member immediate family war conflict serve u.s. military military award family official flag bear gold star lapel pin gold star purple background call service flag families relatives active duty display flag blue star history gold star families grace seibold whose son kill europe 1918 world war one found group come know american gold star mother women lose sons war year president woodrow wilson approve suggestion let u.s. women wear gold gild star traditional black mourn arm band signify loss 1936 unite state begin observe gold star mother day last sunday september organization call gold star wive form end world war two gold star lapel button create 1947. term gold star families widely use world war two different service flag blue star signify relative serve military gold star mean family member die service world war one relatives active duty service members fly service flag bear blue star gold star tradition take hold families cover blue star gold one symbolize loss flag often hang windows many gold star families national gold star family registry note website 472,045 fall service members register relatives families write trump monday letter trump sign relatives u.s. service members kill iraq afghanistan vietnam korea factbox gold star mark sacrifice u.s. military families