Not exact matches
Those missions can be taken somewhat out of order, with «
Side Ops» for
optional objectives.
Side ops and
optional objectives also help with distracting you away from the main quest, and they too provide consistently interesting
objectives with a good payoff in the form of unlocked weapons and skill points.
In each level you are given one primary
objective, and then you are given a list of
optional missions in which you can take along
side those.
During the normal battles there are
optional objectives that you can complete which usually go towards unlocking
side levels.
It makes the game feel a little on the easy
side, but the presentation and completing
optional battle
objectives more than makes up for that.