Let me hopefully put this to rest by providing some hard numbers. I was recently handed my "Personal Statement of Military Compensation" (an annual document that the Army hands out that summarizes your earnings for the year). I am a captain, done with residency, with 5 years active duty in one of the lower-paying specialties. In the past year I earned:
Basic pay (what every CPT in the Army with 5 years earns): 46K
BAH (housing allowance, varies by geographic location): 8K
BAS (some kind of food allowance that I've never really understood): 2K
Variable special pay (varies by time in service, to max of 12K): 5K
Board certification pay (varies with time in servcice, to max of 6K): 2.5K
Medical Additional Special Pay (what you get just for being a doc; every doc gets SAME amount): 15K
Incentive special pay (varies by specialty from 13-36K): 14K
TOTAL: 92.5K
Also, I had 7.5K in "indirect compensation" which is inusrance coverage, tax savings due to housing allowance not being taxable, etc.
Because I just know that someone will ask, the highest incentive pay rates are currently 36K and are for neurosurg, ortho, anesthesia, cardiology, CT surgery, colorectal surg, oncologic surgery, peds surgery, plastic surgery, vascular surg, trauma surg, transplant, and, although it irritates me to no end, radiology (max pay for looking at pictures! what a scam -- the most incredibly overpaid field in all of medicine, military as well as civilian. Just had to editorialize there for a minute)
General Surgeons get 29K; ophtho and urology 28K. ER, GI get 26K. OBGYN gets 31K, ENT gets 30K.
The lowest rate is 12K for peds. Not much better is 13K for aerospace med, Fam Prac, PM&R, and preventive med. Internal med, neuro and psych get 14K. Other medicine and peds subspecialties get either 14K or 23K depending on which one.