Since EHV-1 is a common virus in horses, it is recommended that all horses be vaccinated at least once a year. For horses congregating at shows and competitions, more frequent vaccinations may be recommended.
Enfilade and defilade. Enfilade and defilade are concepts in military tactics used to describe a military formation's exposure to enemy fire. A formation or position is in enfilade if weapons fire can be directed along its longest axis.
DEFCON is an alert system used by the US military. DEFCON is an alert system used by the US military to indicate the current threat of nuclear war. The system has five states of alert, increasing in severity from DEFCON 5 - the least severe - to DEFCON 1 - the highest level. Nuclear war 'IMMINENT' as Russia tells citizens to find bunkers.