Greetings.

One of these constructions might apply

o suqoot Hur (basic generic term) = سقوط حرّ

o Tairaan al-muqfz khilaal al-suqoot al-Hurr = طيران المقفز خلال السقوط الحرّ

o Harakaat al-muqfz khilaal suqootuh al-Hurr = حركات المقفز خلال سقوطه الحرّ

To find the most-commonly-used military terms, you might do some web searches about "sport parachuting" in the United Arab Emirates (UAE). The UAE Armed Forces, IIRC, hosted a regional military parachuting competition a year or so ago, with participation by teams from some of the other Arabian GCC countries (teams from Jordan and Egypt may have also participated).

Ditto for doing a web search about Jordan and Jordan Armed Forces (JAA), as the JAA Special Forces Command, for several decades, has had a competitive military skydiving team (name of the team might be "Red Falcons" in reference to the color of their SF beret).

HTH. Khair, in sha' Allah. خير إن شاء الله

Regards,

Stephen H. Franke
San Pedro, Calfornia