I put this tutorial together while painting two variations of the Heavy Mechanised Infantry for New Antioch from Trench Crusade
Stipple   Camouflage Dark Green  
Stipple using a sponge for the larger areas and a worn brush for the smaller areas. 
Stipple   Pale Green  in smaller areas leaving edges
  Pale Green  
  Cement Grey  in smaller areas again. Use a brush to help define volumes with this step as your 'highlight' which are your most faded areas
  Cement Grey  
Add   Dark Silver  to edges and bolts/rivets  sporadically. Include the power pack, exhaust stack and weapon if you wish.
Add   Silver  less so to edges and the chainmail 
Silver
Using Newsh from Monument Hobbies and combinations of warm browns and oranges for weathering. Here I used   Warm Brown  and   Hot Orange  and   Light Orange  just randomly in mixed and mixed together in various ratios
Newsh weathering
Wash chainmail, weapon, and power pack with   Dark Tone  mixed 50/50 with   Strong Tone  
Weapon, Hammer.   Dark Bronze  and   Silver  with a 50/50 Army painter strong tone and dark tone wash. Highlight back up and add scratches.
Weapon cont.
Base, AK dark earth washed with 2 drops gloss varnish, 2 drops   Dark Tone  , 3 drops   Strong Tone  
Washed
Optionally, I used Vallejo water effects to ad some pooling and puddles. I formed some craters with AK Dark Earth before washing the bases. 
Finished