Before their budget got slashed, NASA was developing a line of spacecrafts named after Ares (source).
Ares rides a Harley in Rick Riordan's The Lightning Thief.
The planet Mars is named after Ares' Roman counterpart.
The aptly named ARES, Inc. is, according to their website, "a High Technology Engineering and Manufacturing Company engaged in weapon systems design, development, manufacturing and testing. Since its establishment in 1971, ARES has participated in a variety of programs ranging from small arms to medium and large caliber automatic cannon and artillery systems" (source).