I'll just stick with the ones I have direct knowledge of. Each of the following requires no more than a two year degree, sometimes less. Vacancy rates nationwide are higher than 15% for each:
Radiologic Technologists (all modalities), Respiratory Therapists, Medical Laboratory Technologists, Medical Informatics professionals, Nurses. In the Mid-Atlantic, the entry level pay for these positions is around $40K/year. Overtime is available. Job security is outstanding, and if benefits aren't necessary, you can work agency for upwards of $80k/year.
Great. So if we're ever invaded in 2012, we can defeat them with our MRI machines.