/dev/characters/{character_id}/fleet/
/legacy/characters/{character_id}/fleet/
/v1/characters/{character_id}/fleet/
curl --location --request GET 'https://esi.evetech.net/latest/characters//fleet/'
{
"fleet_id": 1234567890,
"role": "fleet_commander",
"squad_id": -1,
"wing_id": -1
}