When the NAIS produced its first BattleArmor prototypes, it naturally turned to the most loyal and experienced units it could find to perform field testing. Units chosen for this duty included elite front-line House units, such as the Davion Guards, the NAIS Cadet Cadre, which traditionally tests new weapons, and the renowned mercenaries of the Gray Death Legion. The Legion was issued experimental BattleArmor shortly after its defeat on Sudeten at the hands of Clan Jade Falcon in 3050. Presumably a mercenary outfit was allowed access to such an important and secret project out of gratitude-it was the Legion's momentous discovery of a comprehensive Star League-era computer memory core on Helm in 3028 that led the NAIS to dozens of technological breakthroughs, including the new BattleArmors.
         The Legion proved especially well-suited to its task; it traditionally had made extensive use of infantry, especially in anti-'Mech operations. Although the soldiers were impressed by the suit's capabilities, they quickly compiled a long list of refinements and improvements and sent them to the NAIS. Simultaneously, the Legion's own highly trained technical staff set about making adjustments to the suits themselves in the mean time, well aware that the NAIS bureaucracy could delay the incorporation of design changes for months or even years.
         By late 3051, the Legion engineers had created two distinct versions of Gray Death BattleArmor: a heavy suit closely resembling the standard Inner Sphere armor, and a light scout suit. The Legion's scout armor made its debut against the Jade Falcons on the world of Pandora. Fighting in the thick jungle near the town of Vandmaal, the troops in the new battle suits employed its advanced sensors and enhanced mobility to great effect.

         Designed for advance scouting missions, the "scout suit" was created by stripping away half of the armor protection and the integral weaponry of the standard BattleArmor and adding a jump pack and a complex sensor array. The engineers also replaced the standard suit's mechanical claws with fully articulated armored gloves that enable a wearer to use any desired infantry weapons and equipment. This dexterity also aids the trooper in making effective anti-'Mech attacks by facilitating the accurate placement of explosive charges on a BattleMech.

         The Gray Death Legion manufactures the suits on Glengarry, for themselves and for sale to other mercenary units. Other manufacturing lines have appeared on other planets in the Federation of Skye and the Tikonov Free Republic, both of which also make heavy use of the design.