Florida ? President Barack Obama mourned 14 Americans killed Monday in helicopter crashes in Afghanistan and told a military audience he will not be hurried as he evaluates whether to alter U.S. strategy in the war.

“I will never rush the solemn decision of sending you into harm’s way. I won’t risk your lives unless it is absolutely necessary,” Obama said during a visit to Naval Air Station Jacksonville.

Obama is nearing a decision on whether to commit large numbers of additional troops to the war next year. His top military commander in Afghan-istan favors an increase of roughly 40,000, officials have told The Associated Press, which would allow the U.S. military to expand its reach in areas of the country’s south and east now under Taliban sway.

Obama’s visit to the naval air station came after he convened another in a series of White House war council sessions with about a half-dozen Cabinet officials and other top advisers earlier Monday amid Republican criticism that he is taking too long to choose his next move.