Birthdate on tank
From Halopedia, the Halo wiki
The Birthdate on a Tank is a six digit serial number on the left front tread of the Scorpion Tank in Halo: Combat Evolved. It is 030569. It just so happens that Marcus R. Lehto, Halo's Art Director, was born on March 5, 1969. But on Halo for PC its kinda a blurred white spot but you still tell its there.
