A variant of the SVMS-01 Union Flag (aka Flag), the SVMS-01SG Union Flag Ground Package Shell Type is one of the land combat types known as Ground Package. Commonly called "Shell Flag", its design omitted the regular Flag's back-mounted flight units for extra armor placed all over its body. The extra armor functions like ablative armor, absorbing heat from the enemy's attack and through the resulting vaporization of the armor itself, reduces damage to the mobile suit. While the Shell Flag retains the regular Flag's waist-mounted sub flight units, it cannot fly and can only hover over the ground for several tens of seconds.

Besides the extra armor, the Shell Flag's defensive capabilities are also enhanced through the use of a large defense rod. In terms of offensive capabilities, the Shell Flag has higher firepower with the addition of the 200mm linear cannon and a pair of rocket launchers. It also wields a handheld 120mm linear machine gun instead of the regular Flag's 120mm linear rifle. The motors in Shell Flag's knees and ankles are enlarged to better adapt to ground combat.