Sunday's miracle goal showed Rooney's commitment to the cause.
Rooney's tackle and incredible cross-field pass set up Acosta's third goal of the night in second-half stoppage time.
How more than 100 U.S. soccer players employed clubs abroad fared this weekend.
Through the first half of this season, Chris Durkin started 12 times while Russell Canouse and Junior Moreno recovered from injuries.
Struggling D.C. United introduces two players it hopes will fortify its defense.
Hamid, a homegrown player from Annandale, Va., played for United from 2010 to 2017, making 193 MLS starts for the club.
Jason Levien, who has been with the club since 2012, will serve as CEO and will continue to control United's voting shares in MLS.
Lithuanian left back Vytas acquired for financial considerations.
In the absence of a summer showcase, most player movement was kept to parallel transfers and new loan assignments.
The focus is on teenagers Christian Pulisic, Weston McKennie and Tim Weah, but dozens of others are in Europe and Mexico.