The infranty was divided into divisions rifle divisions, and assault divisions, anti tank divisions, paratrooper divisions, marines, mobile infantry and peace keepers. Each of these infantry types had weapon seriers made for the jobs they did. Rifle divisions were equipped with rifles such as the Karg kurz and the gewerh rifles.
Assault infantry had to clear out bunker or went into close combat urban fights so they used machine pistol such as the famius mp 40 Schmeischer and had the typical potato macher hand grenades. Anti tank infantry was equiped with anti tank weapons. The paratroopers or Falshirm Jäger (parachute hunters) had their own weapon made the FGH.
It wasn't really determined on an individual basis. Each group of soldiers would be proportionally given different types of weapons to deal with different situations. The individual soldiers would simply fulfill whatever role was necessary.
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