<http://webisa.webdatacommons.org/314362302>	<http://www.w3.org/ns/prov#value>	"In 1973, the E-4 took over the mission of the EC-135 flying command post aircraft: to provide safe airborne headquarters for military and civilian leaders, including the president, secretary of Defense, and Joint Chiefs of Staff in times of emergency." .
<http://webisa.webdatacommons.org/314362302>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<boeing.com> .
<http://webisa.webdatacommons.org/prov/133391390>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/314362302> .
<http://webisa.webdatacommons.org/314362302>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .