It's hard to say for sure. While many people claim to have had these spooky experiences, there could be other explanations. Maybe the strange noises are just the old building settling. But then again, the consistency of the stories makes you wonder.
There are tales of strange noises at Clark Air Base Hospital. People claim to have heard disembodied voices in the empty hallways, as if the spirits of the past were still lingering. Some say they've seen shadowy figures moving about in the dimly lit corners, which gives an eerie feeling.
Some of the soldiers in the base might be scared. Naruto's appearance, with his orange jumpsuit and strange ninja tools, would be really out of the ordinary for them. They might think he's an alien or some sort of super - powered threat.
Well, he might be initially confused. Naruto comes from a world with ninjas, not a modern army base. He could think it's some new kind of enemy stronghold. Maybe he'd try to infiltrate it in his typical ninja way, using stealth and jutsus.
In a fanfic where Naruto finds an army base, he might initially be on high alert. He could use his ninja skills to scout the area stealthily. Maybe he would try to figure out if the army base is a threat to his village. If the people in the base seem hostile, he would likely be ready to defend himself using his jutsus like the Rasengan.