Speaking to Pentagon reporters in a video call, Jones declined to provide further details, citing the sensitive nature of the search.
The two Turkish troops went missing Tuesday as the Turkish military pressed an operation to expel Islamic State group jihadists from the border area.
The IS-linked Amaq news agency claimed the jihadist group had taken the pair hostage.
The Syrian Observatory for Human Rights said they disappeared in the Aldana area west of Al Bab in Aleppo province.
Although Turkey is part of the anti-IS coalition, fellow coalition members are not assisting it in the Al Bab region.
The Turkish army embarked on an ambitious operation inside Syria in August to root out IS group jihadists from the border area and halt the advance of Syrian Kurdish militia forces.
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The two Turkish troops went missing Tuesday as the Turkish military pressed an operation to expel Islamic State group jihadists from the border area.
The IS-linked Amaq news agency claimed the jihadist group had taken the pair hostage.
The Syrian Observatory for Human Rights said they disappeared in the Aldana area west of Al Bab in Aleppo province.
Although Turkey is part of the anti-IS coalition, fellow coalition members are not assisting it in the Al Bab region.
The Turkish army embarked on an ambitious operation inside Syria in August to root out IS group jihadists from the border area and halt the advance of Syrian Kurdish militia forces.
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