A Marine Corps veteran who has written extensively about veterans issues condemned Donald Trump’s behavior at Arlington National Cemetery. Ben Kesling, who served as an infantry officer in Afghanistan and Iraq before working as a Wall Street Journal correspondent, analyzed the former president’s photo opportunity with Gold Star families at the gravesites of two service members killed three years ago in the Abbey Gate bombing. “The Trump campaign at Arlington controversy can be confusing,” Kesling said on social media. “Here it is, broken down simply. You can’t bring your own photography crew t…