A helmet is a form of protective gear worn to protect the head.
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Whiting takes helm of U.S. Space Command
'Star Wars: Return of the Jedi' 40th anniversary sees Admiral Ackbar at the helm of his own comic series
Q&A with Dr. Z: Former NASA science chief talks about his 6 years at the helm
Lost city, a real-life 'Helm's Deep,' possibly discovered in Iraq
