Naval Planetary Scan Missions

Is it normal to get almost exclusively planetary scan missions for your naval progression missions? I have up to 12 naval missions at some stations with every one of them being planetary scan missions. Very rarely do I see any other type.
 
Depends on the economy and system type, really. I got my Corvette by doing planetary scan missions almost exclusively
 
Right now i am stuck at ensign.. i want the Corvette bad. Is there a faster way to get the rank. I have been doing missions and throwing money at donations for rep and i get 1% or 3% increase per thing. This will be a long ass grind to get to Admiral for my Vette. Ugghhh! Are there any places to stack missions going to one place. Not looking for easy way out just a little less grind would be nice.
 
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