The mark consists of The letters D, T, and M, all capitalized. The letter D is made of a flint tipped arrow, bent into the shape of the letter. The letter T is composed of an oil well forming the center body of the letter. An ink pen is arranged perpendicularly across the top of the oil well, thus creating the T shape. The pen is dripping ink, while the oil well is spewing black oil from the top. The letter M is composed of four individual pipes, arranged in an M shape. The three letter acronym is encircled by a circular loop of braided rope.