0400 hours in military time is 4 a.m. in the civilian world. However the US Marine Corps does not use the term 'hours'; they would call it '0400.' The Army and Air Force would say '0400 hours.'
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0400 hours in military time is 4 a.m. in the civilian world.
However the US Marine Corps does not use the term 'hours'; they
would call it '0400.' The Army and Air Force would say '0400
hours.'