Is it secure to run Remote Desktop Web Access without VPN?

Currently remote users need to establish Cisco VPN connections before connecting to a Windows 2008 R2 Remote Desktop Server using Remote Desktop Connections. Within the server, they only need to run a corp. application, print to local printers, and do some basic functionality like word and spreadsheet processing. If I have Remote Desktop Web Access setup under SSL, can I eliminate the Cisco VPN and retain the same level of security?