I hope you don't mind me using some stuff you didn't list. If anything doesn't fit, I'll just axe it. I also described the vehicle and the platoon, if that's ok.
First Lieutenant Alexander Darouch, The Rook
2nd Mechanized Infantry Platoon, the Pythons
Three two-man Volans hoverdyne scout vehicles, very light armor, very high mobility, electro-burst ion plates enable extremely quick handling, each with an AXE-3s(double barreled heavy machine gun in laser form, like two AX-7 rifles glued together, with infinite ammo) on an exposed pintle.
Two two-man Raptor fast hoverdyne assault vehicles, light armor, high mobility, each with an external VC2M88 coilgun capable of defeating armored vehicle armor at long range, with an autoloader for a 0.25 shots per second rate of fire.
Two three-man IronClad armored infantry carriers, tracked, heavy armor, medium mobility, an AXE-3(somewhat stronger variant) turret and a Crayven Tech Iron Shield(thousands of 0.34mm phasnium pellets with an iron coating held on magnetic plates on the front, sides and the top of the vehicle, which can be launched with the CTMF magnetic field generator to create a swirling torrent of iron 360 degrees around the vehicle, which protects it against incoming fire to some degree for a short time). Each IronClad carries six men in full combat gear.
Three three-man Warhound armored infantry carriers, magorb wheeled(think I, Robot, the movie), medium armor, medium mobility, an AXE-3s turret and an AX-16VM grenade launcher. Each Warhound carries ten men in full combat gear.
One six-man Watchdog, a Warhound refitted to be an emergency triage center. Can carry three wounded men in med-diag beds and can sacrifice mobility to deploy and double it's capacity.
One three-man Bulldog heavy infantry carrier, tracked, medium armor, heavy front armor, low mobility, equipped with an AXE-3 with a TDm-25 phase upgrade and Crayven Tech Iron Shield. Can be used to ram walls and tow other vehicles. Carries six men in full heavy armored infantry gear.
Two four-man Orion armored assault vehicles, tracked, heavy armor, medium mobility, an AXE-3 turret and a VC2M104 coilgun turret with a rail accelerator for defeating heavy armor at long range with great accuracy using one-and-a-half foot long bars with explosive cores, with a 0.09 rounds per second rate of fire. Also equipped with three Crayven Tech Iron Buckler(an Iron Shield that protects only one side of a vehicle for a much shorter time), one at the front and one at each side.
A four-man Overlord Command armored infantry carrier called Castle, magorb wheeled, medium armor, good mobility, an AXE-3 turret, an AX-16VM grenade launcher turret, a Crayven Tech Iron Shield, a Godview Auspex 9 combat awareness sensor kit and a COMCON communications relay device. The vehicle has a low height profile, just over nine feet, and carries three men in full combat gear. Activating the Iron Shield negates the Godview Auspex and COMCON devices.
Equipment(out of vehicle):
AXs-7, a shorter version of the AX-7 laser rifle variant used for vehicle crews and close combat due to it's lower accuracy, with a TD-23 phase upgrade to improve combat lethality.
EMBAR, his family's legacy, a combat knife with a high power capacitor. Very low-tech, but still very useful. Releases a powerful jolt of electricity when it stabs.
FieldCom Seven commander's field kit, used when separated from the Overlord. Has all the features of the Overlord's command system, but with a low(radius of about 12 kilometers) range and no sensors. It's a backpack with a chest strap which contains an active screen(meaning, two-way) and a headpiece.
Vision tube, a hig-tech binocular with sophisticated optical tracking systems, can be interfaced with the FieldCom Seven.
Provisions packs on his belt with seven days' worth of hydrogel and nutrigel.
No armor, helmet or anything like that.
Alex Darouch, 36, a ten-year veteran of several conflicts, rose to his position and rank through an automatic field promotion on Drevisk Ridge, when his commander's Overlord, the Battlevan, was destroyed by artillery barrage. Through Alex's excellent combat awareness and quick thinking, the Pythons managed to survive the barrage and flank the NA firebase, who believed the platoon to be destroyed. His APC is called Castle, in honor of 1st Lieutenant Francis Castle who died on Drevisk Ridge.
Alex is not a large man by any standards, and never engaged in any more excercise than precisely the amount he needed to pass various monthly qualifications. In his career, he survived his Jackal hoverdyne being shot by an anti-tank round in his first year of service, crawled his way out of a destroyed Warhound in his third year, survived an M-Kill to his Orion on Sarinihal and kept firing from the coilgun turret before abandoning the vehicle, and he managed all that without a single scratch. Other than for regular physicals, he has never visited an infirmary. It is for these feats that his Platoon comrades call him Lucky instead of his chosen callsign, The Rook.
He comes from a long line of fighting men in the Darouch family. His great grandfather fought and died in the Terran Unification wars almost a century ago, his grandfather held the rank of Major in the PRC, and his father fought under the UNSC flag before the formation of the FCS, in which he holds the rank of General. His EMBAR knife, a relic at least two hundred years old, is passed down from father to son for several generations, and has each man's name, rank and division laser-inscribed on both sides of the blade. Alex is never more than a foot away from his knife.
If the first battle is to be entirely on foot, let's say I left Castle after an M-Kill or something like that. I hope everything's OK with this...
P.S. I couldn't resist Ground Control references