BRLESC

It was built by the United States Army's Ballistic Research Laboratory (BRL) at Aberdeen Proving Ground with assistance from the National Bureau of Standards (now the National Institute of Standards and Technology), and was designed to take over the computational workload of EDVAC and ORDVAC, which themselves were successors of ENIAC.

BRLESC was designed primarily for scientific and military tasks requiring high precision and high computational speed, such as ballistics problems, army logistical problems, and weapons systems evaluations.

Instead of the sequence A B C D E F universally used today, the digits 10 to 15 were represented by the letters K S N J F L, corresponding to the teletypewriter characters on five-track paper tape.

The mnemonic phrase "King Size Numbers Just For Laughs" was used to remember the letter sequence.

BRLESC II, using integrated circuits, became operational in November 1967; it was designed to be 200 times faster than ORDVAC.