152 SIG SQN T-shirt - Australian Flag to left sleeve, 152 ‘ORDO AB CHAO’ Insignia on rear.
The insignia was created by the 152 SIG SQN, depicting 'Order Among Chaos' - The Dagger from the flaming sword of Excalibur, the horn as the earliest form of comms, and the spear identifies the 'tip of the spear' for all spheres of operational training and garrison support.
In essence, clear comms brings order to chaos.