In order to determine the hours that would have been worked or paid during the period of absence from work due to or necessitated by USERRA-covered service, the employee's pre-service work schedule can generally be used for calculations. An eligible employee standing in loco parentis to a sibling who is under 18, or who is 18 years of age or older and incapable of self-care because of a mental or physical disability, may take leave to care for the sibling, if the sibling has an FMLA-qualifying serious health condition. It depends on the state policy whether a therapist can fill out FMLA paperwork or not. Given the seriousness of the injuries or illnesses incurred by a servicemember whose family receives an invitational travel order (ITO) or invitational travel authorization (ITA), and the immediate need for the family member at the servicemembers bedside, the regulations require an employer to accept the submission of an ITO or ITA, in lieu of the DOL optional certification form or an employers own form, as sufficient certification of a request for military caregiver leave during the time period specified in the ITO or ITA. Some FMLA forms have a section for a licensed professional signature.