Before the age of MBs, our arrival day would involve going to SOG first, getting out military salute tickets, put on out swim suits is a SOG bathroom, drive to TL or BB, and activate our tickets there right before walking into the waterpark. We never had any issues with WP accuracy during the activation process.
On a separate note, when the military person activates the ticket for someone who is not physically present, they have to know specific things about the absent person so the data is accurate. My memory is not perfect, but I think you may need to know the address, birthdate, and phone number of each person. That may not be hard if you are all family, but if one of the family friends is not present, it may be tough to provide all the required information.