The booming shouts of the rain-soaked Marine recruits echo across Leatherneck Square training field, barely muffled by their masks. And as they jog by, belting out responses to drill instructors in a rhythmic cadence, the white fabric across their faces is the only telltale sign of the coronavirus’ effects on their quest to become Marines. But in ways big and small, the virus is impacting training at the Marine Corps’ Parris Island Recruit Depot and across the military. And defense leaders say some of the adjustments are proving beneficial and could become permanent. Maj. Gen. James Glynn, commander of Parris Island, said requiring recruits to spend two weeks in quarantine before their training has had unexpected benefits. “They are singularly focused on two weeks of mental and emotional prep for what you guys are seeing today,” he said during a visit Wednesday by Defense Secretary Mark Esper. “I think it´s pretty evident it´s making a difference. They´re mentally focused and have reconciled why they´re here.” Until this week, recruits spent the two-week quarantine in a complex of large white tents and bathroom and shower trailers that was quickly built on the base to allow health monitoring and keep them isolated. But now recruits are spending the two weeks in dorms at The Citadel, the Military College of South Carolina, in Charleston, about a two-hour drive north. Esper, who toured the tent area with Glynn, said the new precautions – including masks, social distancing and the quarantine – have greatly lowered the amount of other respiratory illnesses recruits traditionally get. “They´ve seen a much lower sick call right across the board when it comes to infection, so they´re going to keep that. And we´re going to keep some other practices,” said Esper, adding that by breaking the recruits into smaller groups, “they´ve seen a higher level of unity and esprit. And they bonded much more quickly.” As Esper walked around the soggy field, recruits were going through what Marines call the “confidence course.” They were clambering over large log obstacles, climbing towers, shimmying across rope lines strung over a net, and swinging over streams of water. In other sections, recruits were paired off to battle with pugil sticks, which replicates rifle and bayonet combat. Staff Sgt. Katheryn Hunter, a drill instructor for three years at Parris Island, said the main difference she sees due to the virus is that the number of female recruits she has in 4th Battalion, Oscar Company, has dropped to 70. And she has 35 recruits in squad bays that usually hold up to 64. During the initial portion of training, women, who have their own battalion, are largely separated from men. Marine Corps leaders staunchly defend the segregation, saying it helps build confidence, but some members of Congress have demanded change. On the confidence course, female recruits were together on the various obstacles, while the male recruits were doing other tests. The course, Hunter said, is critical. “We have a lot of recruits that are scared of heights, recruits that are scared of water or are scared of different obstacles,” she said, adding that the course “actually tests recruits’ fears, also builds their confidence that they can accomplish stuff as long as they set their minds to it.” In the larger formations, the recruits wore masks, but during some physical tests – even those where teamwork was required and social distancing impossible – the masks came off. Most of the drill instructors wore theirs at all times, as did Esper and his entourage. Commanders noted that the recruits had finished their two-week quarantine and were on day 14 of their actual training – so they had been largely isolated for about a month. Marine recruits go to either Parris Island or to Camp Pendleton in southern California, for 13 weeks of training. Another change, Esper said, is that military recruits often get to go home for two weeks after graduation. That leave has been suspended because of the virus. Instead, the Marines are getting three or four days of little or no duty before reporting to their next schooling or station.