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The Combine Synth Elite Soldier is a Synth enemy cut from Half-Life 2. With the Combine Super Soldier (which somehow stems from it), it is the predecessor of the Overwatch Elite, as well as the direct predecessor of the Combine Guard.
The Combine Synth Elite Soldier is probably a descendant of the "mech" featured in the Weather Control story fragment. The "Combine Elite" is mentioned in the Alyx story fragment; possibly being this unit, although the Combine Super Soldier would also fit the description, both being early elite Combine units.
Raising the Bar features concept art for several versions, most of them sporting a big left arm (generally sporting a weapon) and a thinner right one. Some aspects in these concepts also bear similarities with the Hunter, especially its legs.
Some concepts evolved into the Combine Guard, others into the Combine Super Soldier, to finally end up with the Overwatch Elite.