After receiving his MD degree he started his military service which lasted over 25 years. Zarka served as a doctor in an Armored Battalion of the 401st Brigade and as the brigade's medical officer. He served as a doctor in the 36th Division (Ga'ash Formation) and as Head of the military health branch at the Chief Medical Officer headquarters. At 2008 he was promoted to the rank of Colonel and was appointed as Medical Commander of the Northern Command during the tenure of Gadi Eizenkot as the commanding officer. In 2013 he was appointed as the Commander of the IDF Center for Medical Services and the Head of Health Department in the Medical Corps. In March 2013 he founded and commanded the operation of a field hospital[3] on the Israel-Syria border for the treatment of wounded victims of the Syrian Civil War.
Academics
Zarka served as a senior lecturer in the Department of Military Medicine at the Hebrew University and as a senior lecturer at the Faculty of Social Welfare and Health in the School of Public Health of Haifa University. He has also taught at the Faculty of Medicine at Bar Ilan University.[citation needed]
Zarka has two specialties: one in the field of public health and the other one in the field of medical management, in which he gained vast experience while serving as an assistant to the Director General of the Ministry of Health, Prof. Ronni Gamzu. In this capacity he led the "Rest in Dignity" program (the purpose of which was to provide dignified burial to the samples remaining at forensic pathology institute at Abu Kabir) and project of medical services upgrade across hospitals in northern Israel (Nahariya, Poria and Ziv) as part of establishment of Safed Medical School.[citation needed]
Medical services
At the time of the IDF Operation Protective Edge, during which he served as Commander of the IDF Center for Medical Services, Zarka managed the provision of medical services to the soldiers in the operation area, treatment of hospitalized soldiers and the establishment of military hospital in the Erez Crossing intended to provide assistance for the Gaza Strip citizens.[citation needed]
In 2014, while serving as the Commander of the IDF Center for Medical Services, Zarka suddenly decided to end his military career (although at that time he was a leading candidate for the position of Surgeon General) and to run for the position of the Director of Ziv Medical Center in Safed. He assumed this new role in December 2014. The beginning of his work was followed by a lawsuit filed by doctors who competed against him for the position and lost the tender. The lawsuit alleged that the Civil Service Commissioner was not authorized[4] to approve the late tender application submitted by Zarka following his participation in Operation Protective Edge. The lawsuit was discussed at the Labour Court, where it was decided to hold a repeated tender, in which Zarka again won the position of Director of Ziv Medical Center.
Under the direction of Zarka, Ziv Medical Center lead the humanitarian treatment of wounded in Syrian civil war.[5] About 800 patients were treated at Ziv Medical Center from 2013 to 2016, as part of the Israeli humanitarian aid to Syrian citizens. Under the initiative Operation Good Neighbor, 20% of wounded Syrians brought to Israel for treatment were treated in Ziv Medical Center as of July 2017.[6]
In 2019, Zarka was selected as one of 13 torch-lighters at the annual Independence Day ceremony on Mount Herzl in Jerusalem.[7]
Complicated War Trauma and Care of the Wounded: The Israeli Experience in Medical Care and Humanitarian Support of Syrian Refugees (2017) ISBN9783319533391