Call of Duty 4: Modern Warfare and Modern Warfare RemasteredEdit
"Drop a live grenade when killed."
— Perk description
Martyrdom is unlocked at level 17. A Martyrdom grenade's fuse is 2.5 seconds (opposed to five seconds on a non-Martyrdom grenade and three seconds on a grenade picked up with the Toss Back Perk). Because frag grenades have a large kill radius, this perk is very powerful. The most practical use of Martyrdom is in close quarters combat, where the enemy is less likely to be able to escape the blast.
Martyrdom reappears in Call of Duty: World at War as it did in Call of Duty 4: Modern Warfare. There are no significant differences between the perks in each game, as both grenade fuse times are 2.5 seconds. The only differences would be the general grenade-related changes Treyarch made in Call of Duty: World at War, such as grenade indicator opacity, and decreased damage.
Due to these changes, it is much easier to escape from Martyrdom in Call of Duty: World at War than in Call of Duty 4: Modern Warfare, as the player who killed the Martyrdom user will be able to identify the location of the grenade.
Martyrdom returns as a Deathstreak in Call of Duty: Modern Warfare 2, unlocked at level 27. It requires four consecutive deaths before it can be used (three if using Hardline Pro), so it is seen far less frequently than it was in previous games. It is also less effective, as the grenade fuse time has been increased to that of an uncooked fragmentation grenade.
The decrease in effectiveness has also been further amplified by the reduction in damage and range to the fragmentation grenades in Call of Duty: Modern Warfare 2.
Matryrdom makes a minor appearance in the Campaign mode of Call of Duty: Black Ops. If an enemy is damaged right they pull out a grenade before dying (This is shown in the animation). It also appears in the mission Payback where Kravchenko resorts to pulling out his grenade before dying, in an attempt to kill Woods.
"Drop a live grenade on death. Bonus: Shortens fuse of explosives."
— In-game description.
Martyrdom is featured in Call of Duty: WWII as a Basic Training that is limited to be used in the Throwback Moshpit. It drops a live fragmentation grenade after the user's death and shortens the fuse of the user's any lethal explosives.
As in Call of Duty: Modern Warfare 2, the "Martyr" title can be obtained by killing an enemy with a grenade dropped from Martyrdom. i.e. a player can pick up a grenade from an enemy with Martyrdom, and then kill another enemy with it.