If Spaceman Spiff attaches a flashlight to the front of his spacecraft the light is still going to travel at the speed of light c.
Likewise if he attaches a loudspeaker to his ship in order to yell at aliens, those waves will travel at the speed of sound.
While a military plane going mach five (five times the speed of sound) could hit its own bullets, both sound and light travel at speeds independent of the source.
The plane that attains a speed of mach five will also undergo the most stress as it passes mach one since it experiences the constructive interference of the entire cone of sound at that point.
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