Many moons ago while doning quantitative and qualitative manning analysis for USN /USMC came across the analysis for a USMC F-14 squadron.(Yes I know there never really was one) I found an extra factor in the math for the techs and asked the Master Chief what it was for. He said an extra 10% is always added in to USMC squadrons to give them the time to go do PT, get uniforms ready for parade, go to the rifle range, and other military duties (as if keeping the a/c servicable isn't). The numbers dont lie, so hpe Eurofighter squadrons get 10% extra.