SIR stands for

SIR Units
SIRs are the robotic servants of Irken Invaders.

What does SIR stand for?

 * Selective Information Retrieval
 * Selectively Invasive Robot
 * Semi-Intelligent Robot
 * Sentient Irken Robot
 * Sentinel Irken Robot
 * Sentry Irken Robot
 * Servant Irken Robot
 * Slave Irken Robot
 * Soldier Irken Robot
 * Specialized Invader Robot
 * Supporting Invader Robot
 * Supportive Irken Robot
 * Synthetic Intelligence Robot