The Specialist Strike Package is special in that instead of equipment and air support, players are rewarded with additional perks upon completing the required Strike Chain. Extra perks are obtained after getting two, four, and six points in a row without dying (this is one kill, three kills and five kills with Hardline). If a player achieves eight point streaks (7 with Hardline), they are rewarded with every perk except for Overkill, an additional "Specialist Bonus" in the form of experience, and all Weapon Proficiencies except for Damage, Breath, Impact, and Attachments (Breath and Impact are awarded on the Wii version), regardless of whether the weapon actually allows the Proficiency (for example, one can get Range, Melee and Speed for an Assault Rifle). These also apply to your secondary, and any weapon that you pick up (normally, weapons picked up will have no proficiency). Pro perks are only awarded if they have been unlocked. Once the player dies, they lose any of the extra perks/proficiencies and must start the strike chain over, much like the Assault strike package. The player may choose what perks will be gained in the Create-A-Class menu.
The Specialist Package is a popular choice among players who are trying to obtain the M.O.A.B. due to extra perks and Hardline Pro making the M.O.A.B. require 24 (or less) kills instead of 25 (every 2 assists also count as a kill), as Assault and Support Strike Chain kills do not count towards the M.O.A.B.. Infected is also the easiest mode to get the Specialist Bonus, as Infected players are required to get close to the Survivors in order to knife them, while the Survivors can simply keep their distance as they gun down the Infect (but one must watch out for occasional/rogue Throwing Knifes that may get them despite being in a difficult-to-reach camping spot in order to keep up the Bonus).
The Specialist Strike Package is one of three Strike Chains that has returned to Call of Duty: Ghosts from Call of Duty: Modern Warfare 3. Players receive an extra perk based on kills that are equal to the amount of the perk's point value +1 (In order to get a perk worth 3 points for example, the player needs to get a 4 pointstreak). After getting the third build-up perk, an additional two points are required to receive the OMA specialist bonus which consists of 8 points worth of perks of your choosing.
As you can see, the Specialist Bonus varies in terms of kills.