The SIS A19.5 was a type of medium armor used by Republic

Galactic Republic Organization Galaxy-Wide Organizations

Strategic Information Service

Strategic Information Service (SIS) Organization Galactic Republic (GGW, CW and GW)

during and after the Cold War

The Cold War Event Cold War (3653BBY - 3642BBY)

. The armor set was based on the A19.5 Mercenary armor

Mercenary Armor A19.5 Armor Heavy & Medium Armor

and featured a white and gray color scheme.
The basic kit consisted of pieces of medium armor covering the chest, back and lower legs. The advanced kit included a compact backpack and several additional elements of armor - shoulder shields, separate armor plates covering the chest and back of the wearer, as well as shin guards for boots.