EB Green is a type of heavy duty tape used by the UNSC. It is extremely resilient, and emerald green in color. During the Battle of Reach, Fredric-104 used it to secure a M41 Rocket Launcher into the hull of a Banshee flier. It was also used by the Spartans to tape gear such as magazines on their armor.[1]
EB Green is quite likely to be Duct Tape which would follow the US Submarine Fleet's practice of calling Duct Tape EB Green.