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Army Aviation Medical Standards
Blood and blood–forming tissue diseases
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The below disqualifying conditions are in addition to the disqualifying conditions listed in the Military Medical Accessions Medical Guide. Unlike medical waivers to join the military, medical waivers for aviation duty are much harder to come by.

The causes for medical unfitness for flying duty Classes 1/1A/2/2F/2S/3 are:

a. Anemia, of any etiology.

(1) Males with a hematocrit (HCT) less than 40 percent, or females with an HCT less than 37 percent; or

(2) If a complete hematologic evaluation results in the diagnosis of physiologic anemia, or anemia due to sickle cell trait or beta thalassemia minor; males with a HCT less than 38 percent, or females with a HCT less than 35 percent.

b. History of immunodeficiency diseases.

c. History of splenectomy. For any reason, except trauma.

d. Thrombophlebitis.

(1) Acute, superficial thrombophlebitis until resolved.

(2) History of deep vein thrombophlebitis, thrombosis of any deep vessel, or thromboembolism.

Flight Classes

Specific Flight Class Medical Examinations are:

Class 1 - Warrant Officer Aviation Duty Applicants
Class 1A - Commissioned Officer Aviation Duty Applicants
Class 2 - Current Aviators, Current Student Aviators, and Previous Aviators Returning to Aviation Service
Class 2F - Flight Surgeons, Including Those in Flight Surgeon Training
Class 2S - MOS 13F, Assigned to Aerial Fire Support Observer Duty
Class 3 - Non Rated Soldiers who Participate in Regular Flights (Crew Chiefs, Gunners, UAV Operators, etc.)
Class 4 - Air Traffic Control

Derived from Army Regulation 40-501, Standards of Medical Fitness

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