Type-27 hologram/Gameplay

Campaign and Firefight

 * The T-27 hologram is available on the levels Nightfall, Exodus, and New Alexandria.
 * The hologram is useful in Campaign, since most enemies will fall for it. It is an effective way to test the number of enemies ahead of the player's position.

Multiplayer

 * In multiplayer, one can evade an Type-1 energy sword lunge by deploying a hologram at the last second. In Infection, this gives one a chance to attack the infected.

Campaign

 * It is available on the level Midnight.
 * Like its counterpart in Halo: Reach it is very useful for distracting enemies.

Multiplayer

 * In War Games, projecting a hologram onto a corpse will cause the hologram to crouch up and down, humping it. The effect is not only humorous, it also increases the plausibility of the decoy.