As pledged, the United States has stepped up its assistance to Ebola affected nations with the bringing in of additional military personnel and equipment.

About four days after the arrival of its first consignment, another C-17 aircraft, carrying 39 U.S. military personnel and equipment arrived in Liberia on Tuesday to help in the anti-Ebola fight in West Africa.

The 39 military personnel include 15 U.S. Navy Sea Bees and 24 Operation United Assistance (OUA) Headquarters personnel, a US Embassy statement says in Monrovia today.

The Sea Bees make up the U.S. Navy Construction Battalion.

"The Sea Bees will be conducting site assessments and providing mentorship for the Armed Forces of Liberia (AFL) construction teams, which will be charged with building additional Ebola Treatment Units (ETU)," the statement said. "Discussions are underway on the sites for ETUs and how many will be built."

The C-17 U.S. military aircraft also brought in a tactical truck, a tent system and three pallets of medical supplies.

A total of four C-17 U.S. military aircraft have so far flown into Liberia with U.S. military equipment and personnel for the anti-Ebola fight.

Over the weekend, another two C-17 U.S. military aircraft landed at Roberts International Airport (RIA) with military personnel, including engineers and airfield specialists, which are part of the advance team.

Additional large military aircraft, transporting more personnel and supplies, are expected to arrive in Monrovia in the coming days.