All of the above in 1/48th old chap, but 1/32nd are a bit thin on the ground, apart from relatively expensive individual figures, in resin or white metal.
However, in both scales, there are many possibilities by using other 'sets' not modelled as aircraft related figures.
In 1/48th, I've used Tamiya 'Panzer Servicing Crew' and 'German Infantry on Manouvres', both of which provide figures and accessories which can easily be converted to aircrew, ground crew and so on, with the accessories proving useful for dioramas.
In 1/32nd scale, any or all of the Airfix 'Multi-Pose' sets can be converted, again easily, using releavant sets for basic 'uniform'. For example, for the RAF in the MTO, the 8th Army or Afrika Korps sets can be adapted, and for RAF in the ETO, British Infantry, and German Infantry for Luftwaffe, although virtually any of the sets can be used in some way, with carving easily done in the soft plastic, and items such as flying helmets and 'Mae West' being added from 'Milliput'.
All of these have the added advantage of being modelled to individual requirements, when they won't look the same as everyone else's obvious ICM or Revell figures.
Here's a couple of examples of modified 1/32nd scale Airfix figures, and one of converted 1/48th scale Tamiya Panzer Servicing figure.