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Variations
The Zaku I, like many of the Zeon's mobile suit lines, had a few variations of the basic model, such as the MS-05S Zaku I Commander Type and MS-05J Zaku I Land-Warfare Type.





The land combat Zaku I
MS-05J Zaku I Land-Warfare Type
The land warfare Zaku I was little more than a stock Zaku I repainted in region-specific colors.

Few of these suits would see action, for while the Zaku II series was no longer being mass produced, it was not difficult to obtain one. Most Zaku I's were assigned to pilots that requested them, or to newly-formed squadrons that were unable to obtain the best equipment available. Some would see action in southeast Asia, with at least one assigned to Commander Topp. More would be assigned to the Midnight Fenrir teams. And while Manning and Swaggard would eventually take on additional mobile suits, Austin would keep his Zaku I throughout the remainder of the war, adding different weapons and option parts to suit his liking. These included a shield, the MS-07B Gouf’s heat sword, and even a shield salvaged from a fallen RGM-79 GM.





The MS-05S Zaku I, personal mobile suit of the leader of the Midnight Fenrir Corps
MS-05S Zaku I Commander Type
The MS-05S Zaku I Commander Type was the personal mobile suit of Lieutenant Commander Gerhart Schmeisser, the founder and leader of the Midnight Fenrir Corps. Before the One Year War, Schmeisser was already a decorated mobile suit pilot, and in the opening days of the war proved himself as a soldier. However, during an attack on a facility in New Guinea to clear the way for the Operation British colony drop, Schmeisser was severely wounded in action when a booby-trapped railgun facility blew up. Schmeisser survived, though his injuries prevented him from returning to active combat duty. Despite this handicap, Schmeisser persuaded Admiral Kycillia Zabi to create the Midnight Fenrir Corps. Under his command, the Midnight Fenrir would go on to distinguish themselves in the One Year War. Despite the restriction from combat duty, Schmeisser still used his MS-05S in training missions and in simulations, providing a valuable service to his team even though he could not fight.

The differences between this mobile suit and a regular MS-05B Zaku I were small. The only major differences were a second shoulder dome on the right shoulder, the striking (and often misleading) white and silver custom paint job, and a new shield mounting the fearsome heat saber seen on the MS-07B Gouf. The obvious bonuses of a commander’s type mobile suit aside, the MS-05S was little different from the standard Zaku I being used by the Home Defense Corps, and various out-of-the-way Zeon bases.


Specifications

MS-05A Zaku I
MS-05A Zaku I Early Type
Manufacturer: Zeonic Company
Operator: Principality of Zeon
Unit type: mass production general purpose mobile suit
Dimensions: head height 17.5 meters
Weight: empty 50.3 metric tons; max gross 65.0 metric tons
Powerplant: Minovsky type ultracompact fusion reactor, power output rating unknown
Armament: 105 mm machine gun, drum-fed, 100 rounds per drum, spare drums can be stored on waist armor racks; 280 mm Zaku bazooka, 4 round magazine; heat hawk, battery powered, can be stored on waist armor racks; shotgun
Pilot(s): Matt Austin, Lee Swaggard, Ramba Ral, Gaia, Mash, Ortega


MS-05B Zaku I
MS-05B Zaku I
Manufacturer: Zeonic Company
Operator: Principality of Zeon; civilians
Unit type: mass production general purpose mobile suit
Dimensions: head height 17.5 meters
Weight: empty 50.3 metric tons; max gross 65.0 metric tons
Powerplant: Minovsky type ultracompact fusion reactor, output rated at 899 kW
Armament: 105 mm machine gun, drum-fed, 100 rounds per drum, spare drums can be stored on waist armor racks; ZMP-47D/120 mm machine gun, drum-fed, 100 rounds per drum, spare drums can be stored on waist armor racks; H&L-SB21K/280mmA-N Zaku bazooka, 4 round magazine, can be stored on rack on rear waist armor; heat hawk Type3, battery powered, can be stored on waist armor racks; G-3 nerve gas grenade launcher; sturm faust1; knuckle shield1
Pilot(s): Gadem, Topp, Gabby Hazzard, Matt Austin, Lee Swaggard, Manning, Gaia, Ortega, Mash

1. Information gained from the Zaku I HGUC model


MS-05S Zaku I Commander Type
Manufacturer: Zeonic Company
Operator: Principality of Zeon
Unit type: commander type high powered mobile suit
Dimensions: overall height 18.0 meters; head height 17.5 meters
Weight: Unknown
Powerplant: Minovsky type ultracompact fusion reactor, power output rating unknown
Armament: heat saber, mounted inside shield on left forearm; MMP-80 90 mm machine gun, clip-fed, 32 rounds per clip, spare clips can be stored on waist armor storage racks; 880 mm raketen bazooka, clip-fed, 5 rounds per clip, spare clips can be stored on waist armor storage racks; 90 mm assault rifle; 3-tube missile launcher
Pilot: Gerhart Schmeisser

The "J" was a slip of the finger probably...
and hey, I have a ton of stuff to do, I also did ZII and I'm working on all the rest, so I'm sorry if I make a mistake here or there...