Please assess the completion status of the following clinical trial:

Trial Title: Cognitive-Behavior Therapy for Posttraumatic Headache

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* adult (ages 18 - 70 years old)~* U.S. military Veterans with military service during Operations Enduring Freedom (OEF), Iraqi Freedom (OIF), and New Dawn (OND)~* have sustained a traumatic head injury~* have been diagnosed or report symptoms consistent with chronic (\> 3 months) posttraumatic headache attributed to a traumatic injury sustained as part of military service. We are focusing on chronic PTHA due to the very low likelihood of headache remission after 3 months, the disability associated with chronic PTHA, and the high prevalence of chronic versus acute PTHA in this Veteran population. A positive PTHA diagnosis will be indicated for individuals with de novo headache onset within 3 months of a concussion or exacerbation of pre-existing headache symptoms (increased frequency, duration, or intensity) within 3 months of traumatic injury. This is consistent with the existing ICHD-III criteria for PTHA inclusion will be based on either a pre-existing diagnosis of chronic PTHA documented in the Veteran's medical record by a PRC/PSC provider or a Neurologist (e.g., ICD-10 code G44.329) or through screening with one of our PRC/PSC co-PIs if the Veteran reports symptoms consistent with chronic PTHA but has never had it documented in her/his medical record.~* Participants taking headache medication with a stable pattern of use for the prior 6 week period (including no prescribed changes in medical regimen).~* Participants must have some posttraumatic stress (PTS) symptoms based on a cut-off score of at least 25 or above on the PTSD CheckList -Version (PCL-5), which all participants will complete as part of their screening.~* Participants must also report on the Clinician Administered PTSD Scale (CAPS-5) an exposure to a traumatic event (Criterion A), at least one intrusion symptom (Criterion B), and at least one avoidance symptom (Criterion C). There is some evidence suggesting 40% comorbidity between PTSD and new onset headache, so it is reasonable to assume that at least half of all PTHA participants recruited for this study will have PTHA and comorbid PTS symptoms. The inclusion of PTS symptoms in this sample is vital based on reports indicating that PTS symptoms and PTSD actually increase vulnerability to PTHA and chronic headache in military populations~Exclusion Criteria:~* there has been a recent and significant change in the nature of headache symptoms over the last 6 weeks prior to their screening (as determined by the investigators)~* Participants currently in CPT or prolonged exposure for PTSD.~* Participant has medication overuse headache as defined by the Structured Diagnostic Headache Interview-Revised (Brief Version; SDIHR).~* the participant is unable to read or speak English at a 6th grade level~* they have had a psychiatric hospitalization in the last 12 months~* they currently meet a psychiatric diagnosis of substance abuse \[based on Alcohol Use Disorders Identification Test (AUDIT) assessment during screening\]~* they are pregnant or plan to become pregnant during the trial (due to concerns about pregnancy-induced headache that may obscure findings)~* if a psychiatric problem is present that warrants immediate treatment based upon clinical judgment~* if they demonstrate significant cognitive impairment that could impact treatment adherence/benefit.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- Behavioral Headache Therapy (Type: EXPERIMENTAL): A standard, manualized behavioral intervention for primary headache disorders
- Cognitive Processing Therapy (Type: EXPERIMENTAL): A gold-standard treatment for PTSD, called Cognitive Processing Therapy
- Treatment as Usual (Type: ACTIVE_COMPARATOR): Treatment as usual, receiving standard care for PTHA

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: complete