A Navy sailor swore to protect his country. Feds say he was building drones for ISIS to kill his own.

A 25-year-old sailor in California is in jail after agents found plans to use drones and rockets against elite U.S. troops.

When a person joins the military, they promise to watch their brother's back. This week, we learned about a sailor who was allegedly looking for a way to kill those brothers from the sky.

WHAT HAPPENED

Federal agents arrested a 25-year-old Navy sailor in California. They say he was talking to ISIS and planning a deadly attack on U.S. Special Forces. He did not just want to fight; he wanted to use high-tech tools to do it.

The sailor was based in California when the investigation began. Agents say they found secret messages where he talked about his plans. He wanted to use weaponized drones and rockets to hit elite units.

He was taken into federal custody after the FBI caught his chats. The sailor allegedly chose to follow the path of a terror group instead of the oath he took. He is now facing serious charges for his actions.

What the evidence shows

• The suspect is 25 years old.
• He was a sailor based in California.
• He planned to use drones and RPGs.
• The target was elite U.S. Special Forces units.
• Federal agents caught him through his secret messages.

THE BIGGER QUESTION

How does someone inside our own military fall for the words of a group like ISIS? We spend billions on tech to stop outside threats, but the hardest thing to spot is a change in someone's heart.

Should we be looking closer at the people we trust with our secrets? This story makes us ask if the military is doing enough to check on the mental health and beliefs of its own members.

THE OTHER SIDE

The sailor is now in federal custody and will have a lawyer to defend him. His defense will likely look at how the agents found his messages and if he was pushed into these plans by someone else. Based on the chat logs found by the FBI, the case against him looks very strong.

WHAT HAPPENS NOW

This arrest will likely lead to more checks on sailors and soldiers across the country. It reminds us that the internet can reach anyone, even those behind a base gate. Security on military bases may get even tighter in the coming months.

For the families of Special Forces, this is a scary reminder of the risks their loved ones face. The Navy will have to answer for how one of their own was able to plan such an attack while on duty.

WHAT WE STILL DON'T KNOW

• Did he have any help from other people on the base?
• How long was he talking to ISIS before he was caught?
• Where did he plan to get the drones and rockets?

SOURCE NOTE: Information for this story came from the New York Post. All charges are allegations - the suspect is presumed innocent until proven guilty.