Got a Real-World Weapon, Armour or Tactics Question? Mk. XXVIII

[fusilier]

During the English Civil War, musketeers could carry their own sword, although plug bayonets were issued after that conflict.

Spoiler: Musketeer engraving c1620

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That image comes from De Gheyn's manual (circa 1610, perhaps drawn a little earlier), which covers pike, musketeers, and arquebusiers (shot). The pictures are very well drawn, and can serve as a costume manual. I think almost all soldiers are depicted with both a sword and a dagger. Daggers can also be useful outside of combat, so it's not too surprising that everyone would be carrying one. I imagine it is similar to modern soldiers carrying a pocket knife -- except that there was probably a greater chance that the dagger would be used in combat.