Sentinel

From publisher blurb:

Here come SENTINEL, defender of liberty, justice, mercy, and equity! This patriotic hero isn't a political mercenary or partisan playtoy -- he lives to serve the American people as a hero for the common good of all. A former Marine and Secret Service field agent, Sentinel has now serves the people by fightest with the highest of ideals without compromise. As WatchGuard's field officer & tactician, Sentinel can be viewed as "gruff", but that belies his intentions to protect his teammates while ensuring their efficiency.