there's something called "rule of three",

When we buy 18 planes, usually only 6 is used at a time, 6 is sent for repair/maintenance and 6 on standby. Same goes with helicopter, ship, etc. Right now we're doing 2s, one is used and one is sent for maintenance but that's basically walking on thin line since there is no guarantee that the repair will go smoothly

that's why we need these hornets, so that we can rotate the hornets more.