EXHIBIT 21.1

LIST OF SUBSIDIARIES AND THEIR COUNTRY OR STATE OF INCOPORATION/ORGANIZATION

Name of Subsidiary	State/Country of Incorporation/Organization	Percentage of Voting Securities Owned by Immediate Parent
VTC, LLC d/b/a Total Site Solutions	Maryland		100	%
Vortech, LLC	Maryland		100	%
Innovative Power Systems, Inc.	Virginia		100	%
Alletag Builders, Inc.	Arizona		100	%
Total Site Solutions Arizona, LLC	Arizona		100	%