Drunken Cobra Recovery 2020, what happened to the N95 masks?

Notice that none of these Marines are wearing N95 masks, during the year of The Pandemic.

U.S. Marine Corps photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

AH-1W (Alpha Hotel-One Wiskey) Super-Cobra, during aircraft recovery training at Marine Corps Air Station Miramar, California, 27JUN2020. 

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

U.S. Marine Wing Support Squadron (MWSS) 373, Marine Wing Support Group 37, 3rd Marine Aircraft Wing.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

USMC photo by Lance Corporal Julian Elliott-Drouin, 27JUN2020.

2011-2019:

Why were Marines forced to wear N95 masks during Drunken Cobra Recovery, months before The Pandemic were (sic) declared?