(Green Flag):
Heavy exercises, for activities of unacclimatized personnel will be conducted with caution and under constant supervision.
 
(Yellow Flag):
Strenuous exercises, such as marching at standard cadence, will be suspended for unacclimatized troops in their first 2 or 3 weeks.  Outdoor classes in the sun are to be avoided.
 
(Red Flag):
All physical training will be halted for those troops who have not become thoroughly acclimatized by at least 12 weeks of living and working in the area.  Those troops who are thoroughly acclimatized may carry on limited activity not to exceed 6 hours per day.
 
(Black Flag):
All strenuous non-essential outdoor physical activity will be halted for all units. Essential activities are defined as those activities associated with scheduled exercises or other major training evolutions where the disruption would cause undue burden on personnel or resources, be excessively expensive, or significantly reduce a unit's combat readiness. Essential outdoor physical activity will be conducted at a level that is commensurate with personnel acclimatization as determined by the unit's commanding officer in coordination with the unit's medical officer or medical personnel. All efforts should be made to reschedule activities during cooler periods of the day.