On reevaluation of the above linked presentation, I have no idea what it is trying to state. The presentation was prepared for refresher BGO training for the year 2002 and quoted "averages". I was not at any of the presentations that year so I do not know the intent of the slide. However, there were 4245 official nominations in 2002 and the numbers have been relatively consistent since, not the 6000 as quoted on the slide. The 600 MOC appointments, if they are indeed offers do, in fact, seem kind of low, factoring in 20% attrition and the several states where appointments are not always filled. The SecNav quantity seems high. Annually, there is an average of 75 or so sailors and marines from the fleet. The majority of the remaining NAPSters directly from high school enter with MOC appointments so I feel these candidates may somehow be counted twice. It would also explain the inflated total nomination quantity.
I do know that 500-600 offers are granted annually from the national pool. Since these are typically offered late in the admissions year, do only half accept to cause the 300 number? Also, it would be in the Academy's interest to present this number as the absolute minimum possible, assuming all the other nomination sources are maximized. I don't know.
Sorry for the continuted confusion.